How to Clean a Greasy Range Hood Filter

Grease builds up on your range hood filter every time you cook. It's invisible at first, then it starts blocking airflow, and before long your kitchen smells like last week's dinner. A clogged filter doesn't just trap odors—it makes your hood work harder, wastes energy, and eventually stops doing its job altogether. The fix is straightforward and takes about an hour from start to finish. Most filters respond to a hot soak and some scrubbing, though the method depends on how much grease you're dealing with and what your filter is made of. Done right, your hood will pull air like new, and you'll know when to do it again.

1. Safely Extract the Filter. Turn off the range hood and let it cool for a few minutes if it's been running. Most filters slide out from the underside of the hood or are held by a clip or frame. Slide or unclip it gently and set it aside on a clean surface. If your filter is stuck, use a butter knife or plastic scraper to gently pry it loose—don't force it or you'll bend the frame.
2. Spot Damage Before Cleaning. Look at the filter mesh closely. If you see tears, rust, or missing sections of mesh, the filter is damaged and should be replaced rather than cleaned. A damaged filter won't trap grease or odors properly no matter how well you clean it. Most filters last 3–5 years of regular use before they need replacement.
3. Heat Breaks Grease Down. Use the hottest tap water you have—close to 140°F is ideal. If you have a bathtub with a spray attachment or a deep kitchen sink, that works best. You need enough water to submerge the entire filter. Fill it about three-quarters full. Avoid using a small bowl; the filter needs room to soak evenly.
4. Choose Your Weapon. For light to moderate grease, add a few squirts of dish soap to the hot water and stir. For heavy grease buildup, use a commercial kitchen degreaser following the label instructions, or make a paste with baking soda and water and apply it directly to the filter. If using commercial degreaser, never mix it with bleach or other cleaners. Stir the water to distribute the soap evenly.
5. Let Chemistry Do the Work. Place the filter flat in the hot soapy water, making sure it's fully submerged. Set a timer for 15–20 minutes. The hot water and degreaser will begin breaking down the grease coating on the mesh. For very heavy buildup, soak for up to 30 minutes. Don't leave it much longer than that, as prolonged soaking can weaken the filter frame or cause corrosion.
6. Loosen Every Grain. After soaking, remove the filter from the water carefully—it will be hot. Use an old toothbrush, soft-bristled dish brush, or soft sponge to gently scrub both sides of the mesh. Work in a pattern from top to bottom, following the direction of the mesh. Don't use a stiff wire brush or abrasive scrubber, as these can damage the mesh and reduce its effectiveness. Pay special attention to corners and edges where grease pools.
7. Wash Away All Residue. Hold the filter under warm running water and rinse both sides completely. Use your hand or a soft brush to help rinse away loosened grease and soap. Keep rinsing until the water running off the filter is clear and there are no more bubbles. This step is critical—trapped soap residue will make your hood smell and reduce its effectiveness.
8. Check Against the Light. Hold the clean filter up to the light and look through the mesh. You should see light coming through evenly without dark spots or grease buildup. If you still see significant grease, soak for another 10 minutes, scrub again, and rinse. Most filters come clean after one cycle, but heavily used filters may need two rounds.
9. No Moisture Remains. Stand the filter upright or lay it flat on a clean, dry towel. Don't reinstall a wet filter—water dripping into your range hood or light fixtures will cause problems. Let it air-dry completely, which usually takes 30 minutes to an hour depending on humidity. You can speed this up by placing the filter in a warm, breezy spot or propping it in front of a fan.
10. Seat It Firmly in Place. Once the filter is completely dry, slide it back into the range hood or secure it with the clip or frame, making sure it's positioned in the same direction it came out. Push it in firmly until it seats properly—you should hear or feel a small click or catch if your hood has one. Don't force it; it should slide in smoothly.
11. Verify Airflow Returns. Turn on the range hood and listen for any unusual noises. You should hear steady airflow with no rattling or grinding. The hood should pull smoke and steam away from the stovetop noticeably better than before. Mark your calendar to clean this filter every 1–3 months, depending on how much you cook. Heavy daily cooking may require monthly cleaning; light use might stretch to quarterly.