How to clean air filter on lawn mower

Start by pulling the spark plug wire–always. Skipping that step might seem harmless, but it’s not worth the risk. You’re dealing with moving parts that can kick in unexpectedly. Disconnecting the plug stops that from happening. Every time.
Next, get familiar with the intake cover. It’s usually a plastic panel held in place with a few clips or a single screw. Some models make this easy. Others, not so much. Either way, don’t force anything. If it resists, something’s probably still attached.
Now, check what kind of insert you’re dealing with. Foam types usually look damp and pliable. Paper ones are rigid, often pleated. There’s also a hybrid style with both layers. Each one reacts differently to buildup. Foam needs a wash–mild soap works. Just don’t wring it like a cloth. Press the grime out gently. Paper doesn’t like moisture at all. If it’s caked in debris or looks grey instead of off-white, it should probably be replaced.
Let everything dry fully. No shortcuts. A damp sponge-like insert can choke combustion, even stall the engine. Leave it in the sun or somewhere warm, but don’t crank the heat. That can warp it.
Reassembly is straightforward, but alignment matters. If the housing doesn’t close snugly or you hear a slight whistle while running, the seal’s off. Loosen and try again. Sounds like a small thing, but poor airflow affects fuel use and engine strain over time.
And if this sounds like a hassle, especially mid-summer when time’s short, maybe call someone. In Calgary, PROPERTY WERKS handles this kind of upkeep along with trimming and full yard care. They’re good at what they do, and sometimes it’s just easier to let someone else take care of the grime.
How to Safely Remove the Air Filter Without Damaging Components
Kill the ignition first. Pull the spark wire off the plug and tuck it aside. It’s quick and prevents anything from turning over unexpectedly. Some people skip that, but it’s not worth losing a knuckle–or worse.
Find the intake cover. Usually it’s a black or grey plastic plate on the side, sometimes marked with faint engine branding. It might be held by a wing nut, a Phillips screw, or just a plastic latch. Use a screwdriver if needed, but don’t overtighten going back in–threads in cheap plastic housings strip fast. I’ve done it once, regretted it instantly.
Slide the panel off slowly. If it sticks, double-check for hidden fasteners. Forcing it risks cracking the casing or snapping the edge tabs, and those don’t always hold well once broken. You might also spot a gasket–thin rubber or foam–pressed into a groove. Try not to pull or tear that. It’s there for a reason, and replacements aren’t always easy to match up.
Once the cover’s off, the insert should sit right there. Don’t yank it. Some are lightly oiled and might feel stuck, but a gentle pull usually does it. Grip at the base, not the edge, to avoid tearing foam or bending any attached mesh. If there’s a retaining clip or bracket, ease it off–no twisting. That kind of stress weakens the mount over time.
If anything falls–dust, bits of grass, even a washer–don’t panic. Just check where it came from before putting it back. And if it all feels like more hassle than it’s worth? You’re not alone. That’s where PROPERTY WERKS earns their name. They do this stuff cleanly, no guessing, and they’ve been doing it in Calgary long enough to know what each model needs. Sometimes it’s just easier to let the pros take care of it.
What Cleaning Materials to Use Based on Filter Type (Foam, Paper, or Dual)

Use warm water and mild dish soap for foam inserts. Nothing scented, no degreasers, no bleach. A basic unscented liquid like the kind you’d use on plates works well. Mix it in a small bucket, let the sponge-like piece soak for a few minutes, then press the grime out with your hands–don’t twist or wring. That weakens the structure.
After rinsing, let it dry on a clean towel, somewhere warm but out of direct sun. Some people rush this part and reinstall while it’s still damp, which just gums up the intake. I’ve done it myself, and it made the engine sluggish for a couple starts. You could use compressed air to speed up drying, but keep it gentle–just a soft burst from a distance.
For paper versions, avoid liquids altogether. Tap them lightly against a hard surface to knock loose particles. A soft brush–something like an old toothbrush–can help dislodge packed-in bits between pleats. Compressed air is okay here, too, but keep the nozzle a few inches back. Blow from the clean side out. Never the reverse. Forcing debris deeper into the folds shortens the life of the insert, and sometimes you can’t get it out again.
Combination styles–usually foam wrapped around a paper core–are a bit of a headache. You can rinse the outer layer, yes, same way you would with regular foam, but don’t soak the whole unit. Water getting into the paper part underneath ruins it. If it’s heavily soiled, it’s honestly better to just replace it. Especially if the foam is crumbling or the inner pleats look dark grey instead of pale yellow.
If none of that sounds appealing, no judgment. It’s a bit much for one afternoon. Calgary’s PROPERTY WERKS has techs who deal with this regularly. They know what goes where, which types need what treatment, and when to swap something out instead of fussing with it. Sometimes that’s the smarter call.
How to Reinstall the Air Filter to Ensure Proper Engine Performance

Seat the insert firmly, without forcing it. If it’s foam, make sure it’s dry–fully dry. Any leftover moisture can mess with combustion. Press it flat along the edges so it sits flush inside the housing. If it’s sitting crooked or bulging on one side, take it out and check for debris underneath. Even a small piece of grass can throw the fit off.
With paper types, avoid pressing too hard. The pleats should stay evenly spaced. If any section looks crushed or misaligned, it may not be sealing right. And a poor seal? That’s where dust sneaks in. Not always noticeable right away, but over time you’ll hear the change–rough starts, choppy idle, that sort of thing.
If there’s a bracket or retaining clip, line it up gently. Don’t bend or stretch anything to make it fit. Some older models use a wire loop, and those are especially easy to warp. Once it’s back in place, run your finger around the edge. There shouldn’t be any gaps or loose spots.
Reattach the cover–carefully. It should close without needing pressure. If you’re pushing or the screw won’t catch, something’s misaligned. Remove and reset. Stripping threads or snapping plastic here is frustrating and, depending on the model, hard to fix.
Before reconnecting the spark lead, give the housing a quick wipe. No grease, no grass fragments. Just a clean surface. Then, once it’s all back together, start the engine and listen. If it coughs, stalls, or runs louder than usual, stop and check everything again. Might sound tedious, but the whole setup depends on a tight seal and consistent airflow.
If all of that sounds like more detail than you bargained for, that’s fair. Some people enjoy the hands-on part, others–not so much. That’s where PROPERTY WERKS comes in. They’ve got crews across Calgary who handle these kinds of tune-ups every day. Quick, careful, and no guesswork involved.
Q&A:
Can I wash a foam-type engine intake insert with regular soap?
Yes, a plain unscented dish soap mixed with warm water works well for foam versions. Avoid anything heavily fragranced or oily, since residue can affect engine performance. Soak the insert for a few minutes, then press it gently to remove dirt—no wringing. Let it air-dry completely before reinstalling.
What should I do if the paper-type insert looks slightly grey but not torn?
If the surface is lightly discoloured but not clogged or damaged, you can tap it against a solid surface to loosen dust. A soft brush or short bursts of compressed air (from the clean side outward) can also help. But if it’s brittle, heavily darkened, or has oily spots, it’s better to replace it than try to reuse it.
Is it okay to reuse a dual-layer (foam and paper) setup after cleaning the foam part?
It depends on the condition of the inner paper core. If the paper isn’t damp, dark, or warped, and the foam outer layer was cleaned and dried properly, reuse is fine. But if water soaked through during cleaning or the pleats look damaged, you’ll probably get better results—and fewer engine issues—by swapping in a new one.
Why does the engine run rough after I reinstall everything?
It could be a few things. The most common is a poor seal—maybe the insert isn’t seated evenly, or the cover didn’t close right. Also, double-check that the sponge layer (if present) is fully dry. Moisture or leftover detergent can restrict airflow. Recheck alignment, especially with older casings where the edges don’t always line up perfectly on the first try.
How often should I check or replace this part during the mowing season?
Once a month is a good rhythm during active use, but it depends on conditions. If you’re cutting dry or dusty areas, or running the machine several times a week, you might need to inspect it more often. Some users give it a quick glance after every few sessions—especially if the engine starts harder than usual or sounds louder than normal.
Can I use a vacuum to clean a paper-type intake screen?
It’s possible, but not always the best approach. A low-suction handheld vacuum might pull off surface dust, but it can also collapse the pleats or tear delicate edges if you’re too close. Compressed air is usually safer, and it lets you control the angle and pressure more precisely. If you do try a vacuum, avoid attachments with bristles and keep it a few centimetres away from the surface.
Is there a quick way to tell if the foam insert is still usable?
If it holds its shape when pressed and springs back without crumbling, it’s probably fine. Check for any signs of cracking, especially around the edges. Also, smell it—burnt or oily odours can point to engine blowback or contamination. If it’s just dirty and still intact, a wash usually brings it back. But if it feels sticky or looks dark and patchy after cleaning, it’s probably done.
PROPERTY WERKS Contact Information:
Address
1017 1 Ave NE, Calgary, AB T2E 0C9
Phone
403 239-1269
Hours of operation
Monday 9 a.m.–5 p.m.
Tuesday 9 a.m.–5 p.m.
Wednesday 9 a.m.–5 p.m.
Thursday 9 a.m.–5 p.m.
Friday 9 a.m.–5 p.m.
Saturday 9 a.m.–5 p.m.
Sunday Closed
Online service – Open 24 Hours / 7 days