How To: Spring Cleaning For Your Pellet Grill

A friendly, step-by-step guide to getting your pellet grill ready for the season ahead.

There’s something really nice about that first warm weekend when you walk out to the grill and think, “alright, it’s time.” But before you load up the hopper and get cooking, it’s worth spending a little while going through things. Your grill has been sitting through months of rain, cold, humidity, and whatever else the off-season threw at it. Moisture gets in. Little critters find their way inside. Things wear down quietly while nobody’s looking. A little attention now goes a long way toward making sure your first cook of the year, and every one after it, goes smoothly.

We’re going to walk through the whole process here, step by step. Not just the obvious stuff like scraping down the interior, but the things that tend to get overlooked, the temperature probe, the igniter, the combustion fan, the gaskets. It doesn’t matter whether you’re running a Traeger, a Pit Boss, a Camp Chef, a Green Mountain, or anything else. These steps will serve you well on any pellet grill.

Step 1: Full Interior Inspection

Let’s not rush into cleaning just yet. The very first thing to do is just open things up and have a good look around. You want to see what you’re working with before you start scrubbing or pulling parts.

1. Go ahead and open the lid, then take out the grates, the drip tray, and the heat baffle. Get everything out of the way so you can see the full cooking chamber, top to bottom.
2. Now, take a close look for any signs that something has been living in there. Mice, spiders, wasps, they really do love a quiet, sheltered spot like the inside of a pellet grill, especially if there’s a little leftover food scent drawing them in. Check the corners, the edges, and underneath any components.
3. Have a peek inside the hopper and the auger tube while you’re at it. Rodents will sometimes set up right near the pellet supply, and they’ve been known to chew through wiring, which can cause real problems down the road.
4. Clear out anything you find, nesting material, droppings, cobwebs, dust, all of it. We want a clean slate before we go any further.

Tip: If you do find signs that rodents have been in there, go ahead and give those areas a wipe-down with a food-safe cleaner or some diluted white vinegar. Just a little peace of mind before you cook your first meal of the season.

Step 2: Check Your Pellet Quality

This is one of those things that can save you a lot of headaches. The pellets sitting in your hopper right now have been through the whole off-season, and if moisture found its way in, they’re not going to perform the way you need them to. Pellet quality affects just about everything, how well the grill ignites, how steady it holds temperature, how clean the smoke is, and how much ash builds up.

1. Start by checking the pellets in the hopper and in the auger tube that leads down to the burnpot.
2. Pick one up and give it a snap between your fingers. A good pellet will break with a clean snap, or it’ll be too solid to break at all. If it crumbles apart or feels soft and mushy, that means moisture has gotten into the wood. Those pellets have done their time.
3. And here’s the thing, bad pellets don’t just burn poorly. When they absorb moisture, they swell up and can actually jam the auger. They produce a lot more ash than they should, they put out less heat, and that leads to temperature drops, weak smoke, and failed ignitions where you open the lid and find a pile of unlit pellets just sitting there. If they don’t pass the snap test, it’s best to let them go.
4. Empty out the hopper and the auger tube completely, and vacuum up every bit of pellet dust and fragments left behind. A shop vac or ash vacuum works well for this.
5. It’s also a good idea to check whatever pellets you have in storage. Make sure the bags are still sealed and in good shape, and that the pellets inside feel firm and dry.
6. If you need to purchase new pellets, take a look at our Pellet Flavor Guide to pair the best type of pellets for the kinds of food you like to cook.

Storage Tip: If you’ve got opened bags, pour them into a sealed five-gallon bucket or one of those big airtight pet food containers. Keep them up off the floor and somewhere dry. Even unopened bags can pull moisture right through the packaging if they’re sitting directly on a concrete garage floor. A little care here goes a long way.

Step 3: Clean the Firepot and Burnpot

Now we’re getting to the heart of things. The firepot, some folks call it the burnpot, is where pellets get delivered by the auger and lit up by the hot rod. When this part is clean and clear, everything runs the way it should. When it’s packed with ash or clogged up, that’s where most of those frustrating temperature problems and failed startups come from. More than just about anything else on the grill, this is the one to keep clean.

1. You should already have the heat baffle and drip tray out from Step 1, so go ahead and look straight down into the burnpot at the bottom of the cooking chamber.
2. Vacuum out all the accumulated ash. A regular shop vac will work, but if you have a dedicated ash vacuum with a fine-particle filter, that’s even better. The fine dust from pellet ash can clog up a standard vacuum filter pretty quickly and wear down the motor over time.
3. Take a look at the holes and slots in the burnpot itself. These need to be clear, airflow through those openings is what keeps combustion going the way it should. If you find hardened ash or grease blocking them, a small brush or a wooden skewer will take care of it nicely.
4. And don’t forget the area around the firepot. Go ahead and vacuum the entire floor of the cooking chamber. Ash that builds up here can restrict airflow and lead to uneven temperatures across the grate, and we don’t want that.

Tip: If you’re in the market for an ash vacuum, take a look at our Ash Vacuum Collection. A purpose-built unit with the right filtration will hold up much better over time than putting your household shop vac through this kind of work.

Step 4: Inspect the RTD Temperature Probe

Here’s one that a lot of folks don’t think about, but it really does make a difference. Your grill has a small temperature sensor inside the cooking chamber called the RTD probe, that stands for Resistance Temperature Detector. It’s how the controller knows what temperature you’re actually running at. After a season of cooking, grease builds up on it, and when that happens, the readings start drifting. The controller tries to compensate, but it’s working with bad information, and you end up chasing temperature swings that just don’t seem to have a reason.

1. Find the probe inside your cooking chamber. On most grills, it’s a small metal rod mounted to the interior wall, usually over on the left side.
2. Give it a gentle wipe with a soft cloth or paper towel dampened with some warm water. That’s really all it takes. Grease on the probe is the most common reason for temperature readings being off, and cleaning it is about a two-minute job.
3. One thing to keep in mind, don’t use anything abrasive or any harsh chemicals on it. The sensor is delicate, and rough handling can cause damage.
4. While you’re there, make sure the probe is sitting securely in its mount and that the wire connection looks good. If it’s loose or the wiring looks worn, that’s one you’ll want to replace.

Important: When the probe is dirty, the controller is essentially guessing. That leads to overcooking, undercooking, and temperatures that bounce around for no apparent reason. A couple minutes with a damp cloth here can save you a whole lot of wondering what went wrong later on.

Step 5: Check the Hot Rod and Combustion Fan

These two work together to get your fire started and keep it going. If either one isn’t doing its job well, you’ll run into ignition trouble or temperatures that just won’t stay where you set them. And it’s a much nicer experience to find that out now, during a calm cleaning session, than when you’re counting on the grill and it won’t cooperate.

Hot Rod

1. The hot rod is the little element down in the firepot that heats up and lights the pellets. It does a simple but important job, and like anything that gets red-hot over and over, it wears down gradually and will eventually need replacing.
2. Here’s how to check it: plug the grill in and run a normal startup cycle. Keep an eye on the firepot. Within a minute or two, you should see the hot rod glowing a nice bright orange.
3. If there’s no glow at all, it’s time for a new one. If the glow is faint or it takes a long time to get going, it’s getting close to the end of its life. Replacing it now, while you’re already in maintenance mode, is a lot easier than dealing with it mid-season.

Combustion Fan

1. The combustion fan, sometimes called the induction fan, is what feeds oxygen into the firepot. Without good airflow there, the fire can’t sustain itself properly. Over time, dust and grease build up on the blades and start choking that airflow down.
2. Find the fan on your grill, it’s usually accessible from the back or the underside. Your owner’s manual will point you to the right spot for your particular model.
3. Wipe the blades down with a damp cloth, or give them a pass with some compressed air. Then spin the fan gently by hand. It should turn freely and smoothly, with no wobble, grinding, or resistance. If something feels off, it’s worth investigating further.

Step 6: Food Residue, Grease, and Mold

Leftover grease and food residue are the ones most people expect to deal with, and for good reason. But mold is the one that tends to catch folks by surprise. If a grill gets closed up with some moisture or grease still inside, and then sits for a few months, mold can absolutely move in. You might see white patches, green spots, or dark fuzz in the corners. It happens more often than you’d think, and it’s nothing to worry about, it just needs to be cleaned up before you cook.

1. Go over the entire interior of the cooking chamber, including the underside of the lid. Look for grease buildup, caked-on drippings, and any discoloration that might be mold.
2. Mold is especially common in grills that were closed up while things were still damp or greasy inside. If you spot some, it cleans up well, just make sure you address it before putting any food on the grate.
3. Use a plastic or wooden scraper to work over the interior walls and the underside of the lid. Metal scrapers can damage the painted surfaces inside, so it’s best to keep those out of the picture. Check out our Grill Cleaning Accessories if you need a new scraper.
4. Once you’ve scraped things down, go over everything with a good degreaser. Wipe it all clean and let the surfaces dry completely before putting things back together.

Tip: Simple Green degreaser does a wonderful job here, and you can pick it up at just about any dollar store or department store. Give it a spray, let it sit for a few minutes, then wipe clean. Easy and effective.

Step 7: Check for Rust

Rust is one of those things that’s always working quietly in the background. Your grill sits through rain, humidity, and big temperature swings, and anywhere the paint has chipped or worn thin, moisture finds a way in. The good news is that if you catch it early, it’s a quick and easy fix. Leave it alone, though, and it’ll keep spreading until the metal is compromised.

Heat Baffle and Drip Tray

A little surface rust on the heat baffle and drip tray is perfectly normal, no need to scrub it off. These parts are built to handle high heat, and a bit of surface oxidation is just part of their life. The thing to watch for is rust that has gone all the way through the metal. A drip tray with holes in it lets grease fall straight down onto the firepot, and that’s both a fire concern and a performance issue. If you can see through it, it’s time for a replacement. Replacement heat baffles and drip trays can be found in our Grill Collection.

Grill Body and Exterior

1. Take a walk around the whole grill, inside and out, and look for anywhere the paint has chipped, bubbled, or where rust is starting to show.
2. If you find a spot, sand it down with some fine-grit sandpaper or a wire brush until you’re back to clean, bare metal.
3. Then seal it up with a high-temperature grill paint, something rated for at least 500°F. That stops the rust in its tracks and protects the exposed metal going forward.
4. Pay a little extra attention to the usual trouble spots: the bottom of the grill body, the areas around welds, and near the chimney cap. These are the places where moisture tends to collect and where rust likes to show up first.

Important: A little rust now turns into a lot of rust surprisingly fast. Taking care of it early can add real years to the life of your grill. It’s one of those small efforts that really pays off.

Step 8: Touch Up Your Cast Iron

Cast iron is wonderful stuff. It holds heat beautifully and lasts a long time when it’s looked after. But if the seasoning layer wears through and bare metal gets exposed to moisture, rust can set in quickly. If your grill has cast iron grates, griddle inserts, or pans, they deserve a little attention of their own.

1. Take all your cast iron pieces out and give them a good close look. You’re checking for rust, flaking, or any spots where the seasoning has worn away and bare metal is showing.
2. If you find rust: That’s alright, it happens. Scrub the rust off with steel wool or a stiff wire brush until you’re back to clean metal. Give it a wash with warm soapy water and dry it right away, don’t let it sit and air dry. Then re-season it by rubbing on a thin, even coat of a high-smoke-point oil like flaxseed, canola, or vegetable oil, and putting it in the oven at 450°F for about an hour. Do that two or three times and you’ll have a nice, durable seasoning layer built back up.
3. If everything looks good: Just give it a light coat of oil and run the grill at around 350°F for about an hour. That bakes the oil right into the iron and keeps the seasoning in great shape heading into the new season.

Tip: Consider using a drip tray liner. They’re inexpensive, disposable, and they catch the grease before it ever reaches the tray itself. A small thing that makes cleanup so much easier as the season goes on.

Step 9: Inspect Gaskets and Seals

This is one of those quiet things that makes a bigger difference than most people realize. The gasket around your grill lid is what keeps the heat in and controls how smoke moves through the chamber. When it starts to go, you won’t get a warning light, you’ll just notice the grill burning through pellets a little faster, taking longer to reach temperature, and having a harder time holding steady, especially when it’s cold or windy outside.

1. Close the lid and take a look all the way around the seal. A healthy gasket makes contact the entire way around with no gaps or daylight showing through.
2. Run your hand along the gasket material. Feel for sections that have gone hard, cracked, gotten pressed flat, or started peeling away from the lid.
3. If the gasket is worn out, go ahead and replace it. Kits are available from most pellet grill manufacturers, and the installation is pretty straightforward. It’s a small job that makes a real difference in how the grill performs.
4. A failing seal tends to show up as subtle symptoms, a little more pellet use, a little more time to come up to temp, a little more inconsistency. Checking it now is how you stay ahead of all that.

Step 10: Accessories and Equipment

Before your first cook of the season, take some time to go through all of your Grilling Tools and Accessories. Make sure your meat thermometer is still reading accurately, as batteries may have died or calibration may have drifted over the winter. Look over any grill covers, mats, or side shelves for weather damage and wear. Replacing or repairing these items now means you won't be caught off guard mid-cook when you need them most. Check tongs, spatulas, and grill brushes for loose handles or damaged bristles. Worn-out wire brush bristles in particular can be a safety hazard if they break off and end up in food. 

Good quality tools make cooking easier. We carry a 3-piece stainless steel grilling set with rosewood handles, available here. Each tool has a loop on the end so you can hang it on your grill for easy access and storage.

Step 11: Update Your Firmware

It might sound a little funny, but your grill runs on software too. If yours has Wi-Fi, take a moment to connect it and let it check for any available updates. Manufacturers put out improvements to temperature control, bug fixes, new features, and better app connectivity throughout the year. It only takes a few minutes, and sometimes a firmware update makes a noticeable difference in how smoothly the grill holds temperature.

Check your manufacturer’s app or their website for instructions specific to your model. Well worth the few minutes it takes.

Step 12: Run a Burn-Off

Alright, we’re in the home stretch. Everything is cleaned, inspected, and back in place. Before you put any food on the grill, though, there’s one more step, and it’s an important one that a lot of guides leave out.

1. Put it all back together: burnpot, heat baffle, drip tray (with a fresh liner if you use them), and your grates.
2. Fill the hopper up with fresh, dry pellets.
3. Fire the grill up and run it nice and hot, somewhere around 400 to 450°F, for about 20 to 30 minutes with the lid closed.
4. This does a few good things all at once. It burns away any cleaning product residue that might still be on the surfaces, it takes care of any contaminants you may have missed, and it gives you a chance to confirm that the grill is heating properly and holding temperature before any food goes on. Think of it as the final check that everything is working just the way it should.

Important: Please don’t skip this step. Cooking right after a deep clean means there could still be cleaning residue on the surfaces, and that’s not something you want on your food. The burn-off takes care of it, and it’s your first real confirmation that the grill is ready to go.

Frequently Asked Questions

How often should I deep clean my pellet grill?

At least once a year, and the start of grilling season is the perfect time for it. If you’re someone who cooks on the grill several times a week, a mid-season deep clean is a nice idea too. In between, just keep up with the basics, vacuum the firepot and empty the grease bucket every few cooks, and you’ll be in great shape.

Can I use a regular household vacuum to clean ash?

You can get away with it once or twice, and it won’t cause any immediate problems. But the fine ash particles from pellets will clog up a standard filter pretty quickly and can wear the motor down over time. If you’re planning to maintain your grill on a regular basis, it’s worth picking up a dedicated ash vacuum with a fine-particle filter. It’ll hold up a lot better for this kind of work.

What if I find mold inside my grill?

It’s more common than you might expect, and it’s really nothing to worry about. Just clean the affected areas with a good degreaser or some diluted vinegar, wipe everything down well, and then run a burn-off at high heat for 20 to 30 minutes. That takes care of any remaining spores. After that, your grill is perfectly safe to cook on.

How do I know if my igniter is going bad?

Usually the first thing you’ll notice is that the grill is taking longer to start up than it used to, or it doesn’t ignite at all and you open the lid to find a pile of raw pellets sitting in the firepot. If you can see the hot rod, watch it during a startup cycle. It should be glowing a nice bright orange within a couple of minutes. If the glow is faint, slow to come on, or not there at all, it’s time to put a new one in.

Do I need to re-season my cast iron every year?

Not unless the seasoning has been compromised. If you see rust or bare metal, then yes, give it a full strip and re-season. But if the coating still looks good and feels smooth to the touch, a light coat of oil and an hour on the grill is all it needs. That’s enough to refresh the protective layer and keep everything in good condition.

My grill has been sitting unused for over a year. Is this guide enough?

For the main cleaning and inspection, absolutely. But when a grill has been sitting that long, it’s a good idea to add a few extra checks. Take a close look at all the wiring and electrical connections for any signs of corrosion or damage, inspect the auger motor, and check the chimney or exhaust vent for blockages. If anything looks frayed, corroded, or physically compromised in a way that concerns you, it’s best to reach out to your manufacturer or a qualified technician before firing it up.

Take care of all this before your first cookout, and your grill will reward you with clean, steady, reliable performance all season long. Enjoy every bit of it.