The fastest way: soak and scrub

The easiest method is to soak your filter in hot soapy water, then scrub it with a brush. Remove the filter from the hood, fill a bathtub or large sink with hot water and a few squirts of dish soap, drop the filter in, and let it sit for 15 to 30 minutes. The grease softens during soaking, so you can scrub it away with a soft-bristled brush or an old toothbrush without much force. Rinse under running water until the water runs clear, shake off excess water, and slide it back into the hood.

This method works best on filters that are moderately greasy — not brand new and not caked with months of buildup. If your filter is very dirty, soak it longer, up to an hour. If it is only lightly dusty, you may skip soaking and just rinse and brush.

Key Takeaways

  • Soak your filter in hot soapy water for 15 to 30 minutes, then scrub with a soft brush and rinse until water runs clear.
  • For heavy grease buildup, use baking soda mixed into a paste, explore it to the filter, let it sit for 10 minutes, then scrub and rinse.
  • Never use a dishwasher on a metal mesh filter — the heat and pressure can warp it or damage the mesh.
  • Clean your filter every one to three months depending on how much you cook; more frequent cooking means more frequent cleaning.

Baking soda paste for heavy grease

If soaking alone does not remove all the grease, make a paste of baking soda and water. Mix three parts baking soda with one part water until it reaches a thick, spreadable consistency. Spread the paste over both sides of the filter, paying extra attention to the areas with the heaviest grease. Let it sit for 10 minutes — the baking soda breaks down grease without scratching the metal.

After 10 minutes, scrub the filter with a soft brush or sponge, working in small circles. Rinse thoroughly under hot running water. If grease remains, repeat the paste process and scrubbing. This method is gentler than commercial degreasers and works on both aluminum mesh and stainless steel filters.

Vinegar soak for stubborn buildup

White vinegar cuts through old, hardened grease. Fill your sink or tub with equal parts white vinegar and hot water, submerge the filter, and let it soak for 30 to 45 minutes. The acid in the vinegar dissolves grease that water alone cannot budge. After soaking, scrub with a brush and rinse well under running water.

Vinegar works especially well on filters that have not been cleaned in several months. The smell is strong while soaking, so open a window or run a fan. Once rinsed and dry, the vinegar smell disappears completely.

What not to do

Do not put a metal mesh filter in the dishwasher. The high heat and water pressure can warp the mesh or bend the frame, and the filter may not fit back into the hood properly. Charcoal filters (the round or rectangular cartridge type) should also not go in the dishwasher — they cannot be cleaned this way and must be replaced when dirty.

Avoid steel wool, scouring pads, or stiff brushes on aluminum filters, as these scratch and damage the mesh. Soft brushes, sponges, and cloth work without harming the filter. Do not use bleach or harsh chemical degreasers unless the filter manufacturer specifically says it is safe — most do not recommend them.

How often to clean

Clean your filter every one to three months. If you cook daily or use high heat often, clean it monthly. If you cook occasionally or mostly at low temperatures, every three months is usually enough. A clogged filter reduces the hood's ability to remove smoke and steam, so do not wait until it looks black.

A quick way to know when it is time: hold the filter up to a light. If you cannot see light through the mesh clearly, it needs cleaning. Some people set a phone reminder on the first of each month to check their filter.

Drying and reinstalling

After rinsing, shake the filter gently to remove excess water. You can stand it upright in a dish rack to air dry, or wipe it with a clean cloth. Let it dry completely before sliding it back into the hood — a wet filter can drip onto your stovetop. Most filters dry in 30 minutes to an hour if you wipe them first.

When reinstalling, make sure the filter slides all the way in and sits flush with the hood frame. If it does not fit smoothly, check that you have not bent the frame during cleaning. A properly seated filter will feel snug but not forced.

Frequently Asked Questions

Can I clean a charcoal filter?

No. Charcoal filters trap odors and cannot be washed. Once they are dirty, they must be replaced. Most charcoal filters last three to six months depending on cooking frequency. Check your hood's manual for the correct replacement filter model.

What if my filter is aluminum and the mesh is dented?

A dented mesh still works, but it may not seal as well in the frame. If the dent is small, you can try gently tapping it out from the back with a rubber mallet, but be careful not to tear the mesh. If the damage is severe, replacement is safer than trying to repair it.

Is it safe to use oven cleaner on the filter?

Oven cleaner is very harsh and can damage the filter frame or leave chemical residue. Stick with baking soda, vinegar, or mild dish soap. These are safer, cheaper, and work just as well on kitchen grease.

Why does my filter still smell like grease after cleaning?

The mesh may have absorbed odor into the metal itself. Soak it again in vinegar and water for a longer period — up to an hour. If the smell persists after multiple cleanings, the filter may be nearing the end of its life and replacement might be necessary.