How to Clean a Vacuum Filter: Foam, Pleated and HEPA

Short answer: Unplug the vacuum, take the filter out, and tap it over a trash bag to knock out loose dust. If the manual says it is washable, rinse it under cold or lukewarm water with no soap until the water runs clear, shake it, and let it air dry for at least 24 hours before putting it back. If it is not washable, tap it clean and replace it on the maker’s schedule.

You need: your vacuum’s manual (or the model number to look it up), a trash bag, and a sink. Time: 5 minutes of work, 24 hours of drying.

Why the filter matters

Every vacuum pulls air in through the dirt and pushes it out again. Filters catch the fine dust before that air comes back into the room, and protect the motor. A clogged filter cuts suction, makes the motor work harder and run hotter, and can make the vacuum smell. If your vacuum has lost suction and the bin is empty, a dirty filter is the first thing to check.

Find your filters

Many vacuums have more than one:

Pre-motor filter: sits between the bin or bag and the motor. Often foam or felt, sometimes a pleated or mesh cone inside a cyclone.
Post-motor or exhaust filter: cleans the air leaving the vacuum. On many vacuums this is the HEPA filter.
Cyclone mesh or shroud: the metal or plastic screen inside a bagless bin.

Your manual shows where each one is. On cordless stick vacuums, the filter is usually on top of or inside the bin and twists out. On robot vacuums it is a small flat filter in the dustbin.

Step 1: Unplug and empty

Unplug the vacuum or take the battery out. Empty the bin or remove the bag first so you do not spill more dust while you work. Do this outside or over a trash bag if you can, especially with allergies.

Step 2: Tap out the dust

Hold the filter inside a trash bag and tap it firmly against the inside of the bin or bag. Do not bang a pleated filter against something hard enough to dent it. For pleated filters, a soft brush between the pleats helps. This is the only cleaning a non-washable filter gets.

Step 3: Wash it, if it is washable

Look for “washable” in the manual or printed on the filter.

Foam and felt filters: rinse under cold or lukewarm water and squeeze gently, like a sponge, until the water runs clear. No soap or detergent unless the manual allows it; residue clogs the material.
Washable pleated and HEPA filters: rinse with water only, pleats facing down, letting the water run through from the clean side. Do not scrub, brush hard or twist the media.
Cyclone mesh: rinse and wipe off hair and dust. Some come out; some only wipe clean in place.

Shake out the extra water.

Step 4: Dry it completely

Stand the filter upright, or on its side for pleated ones, in a warm, airy spot out of direct sun. Leave it at least 24 hours, longer for thick foam. A damp filter will grow mildew and can damage the motor. Do not use a hair dryer, a clothes dryer, an oven, a microwave or a radiator; heat warps and shrinks filter materials. If you vacuum often, keep a spare filter so you can swap it in while the other dries.

Step 5: Put it back correctly

Check it is fully dry by feel and weight. Fit it the right way around: most filters have an arrow or “this side up” mark, and a filter fitted backward or not seated properly lets dust bypass it and reach the motor.

When to replace instead of clean

Replace a filter when:

It is torn, warped, crumbling or has holes.
It still looks grey and clogged after a good rinse.
Suction stays weak even with a clean filter and empty bin (also check the hose and brush roll for blockages).
The maker’s schedule says so. Non-washable HEPA filters are commonly replaced every 6 to 12 months, but go by your manual.

Buy filters made for your exact model. Third-party filters can be cheaper; check that the dimensions and seal match.

While you are at it

Wash the bin with warm water and let it dry fully.
Cut hair off the brush roll with scissors, sliding the blade along the groove if there is one.
Check the hose for clogs by dropping a coin through it.

For robot vacuums, our guide on how to clean a robot vacuum covers the brushes, sensors and wheels too.

FAQ

How often should I clean my vacuum filter?

Tap out or rinse washable filters about once a month with regular use, and more often with pets or in a dusty home. Many cordless vacuum makers suggest rinsing the filter monthly. Check your manual for the exact interval.

Can you wash a HEPA filter?

Only if the manual or the filter itself says washable. Many HEPA filters are made of paper-like media that water ruins. Non-washable HEPA filters should be tapped clean and replaced on schedule, often every 6 to 12 months.

How long does a vacuum filter take to dry?

At least 24 hours at room temperature, and longer for thick foam. Never put it back damp, and never dry it with a hair dryer, in a dryer, oven or microwave, or in direct heat.

Why does my vacuum smell after I washed the filter?

Usually because the filter went back in before it was completely dry and grew mildew, or because dirt in the bin, hose or brush roll is the real source. Dry the filter fully, wash the bin, and check the brush roll for trapped hair.