Clean your range hood grease filters every 1 to 3 months if you cook regularly, every 4 to 6 weeks if you fry or sauté often. A clogged filter is a fire hazard and it makes the hood nearly useless, so this is one of the maintenance jobs worth staying on top of.
Which filter you have
Most residential hoods use aluminum mesh or baffle filters. Mesh are the thin, layered, mostly flat silver panels. Baffle are thicker with curved channels, common on commercial-style hoods. Both trap grease the same way, they just clean a little differently.
Some older or budget hoods use charcoal filters for ductless, recirculating setups. Those can’t be washed. Replace them every 3 to 6 months, sooner with heavy cooking. Check the manual if you’re not sure which you’ve got.
Cleaning mesh or baffle filters
You need a degreasing dish soap (Dawn works), hot water, a non-scratch brush, and a sink or a dishwasher. That’s it.
Dishwasher (easiest): pop the filters out and run them on the hottest cycle with regular detergent. Fine for light to moderate grease. One note, stainless baffle filters take dishwasher cycles fine, but aluminum mesh can degrade over time from the alkaline detergent, so check your manufacturer’s guidance before making it a habit. Still greasy after the cycle, move to the soak.
Soak (better for heavy grease): get a large pot near boiling, or fill a plugged sink with the hottest tap water. Add a good squeeze of dish soap and about a quarter cup of baking soda. Submerge the filters 15 to 30 minutes. The water turning brown is the grease letting go, which is what you want. Scrub with the brush, then rinse well with hot water.
Dry them fully before reinstalling. Wet filters grow mildew and drip into your cooking.
Telling when a filter’s too far gone
The obvious sign is visible grease. Hold a mesh filter to the light and if the holes are mostly blocked, it’s due. Another sign is falling suction, the hood feels like it’s barely working even on high. You’ll also notice more smoke or grease haze hanging around while you cook.
Some hoods have a grease indicator or maintenance light. Handy, but they’re usually just timers and don’t know how much you actually cook.
Don’t forget the grease cup
Most baffle hoods have a small tray or cup that catches liquid grease. Empty and wash it every time you clean the filters. Let it go too long and it overflows onto the cooktop, which in the worst case is a fire source.
What to skip
No steel wool or abrasive pads on aluminum mesh. They scratch and distort it, which traps more grease over time. Harsh solvents aren’t needed and leave residue. Hot water and a good degreasing soap handle almost everything.
And don’t try to “clean” filters in the oven on self-clean. The grease smokes hard and it’s a genuine fire risk.
While you’re in there
With the filters out, wipe the inside of the hood with a damp cloth and a little dish soap, grease builds on the interior too, especially right where the filters sit. The exterior takes a degreaser or warm soapy water. On stainless, use a stainless cleaner and wipe with the grain to avoid streaks.
When to call a pro
Cleaning the filters is a straightforward DIY job. A few situations call for a tech.
If suction’s still noticeably weak after clean filters go back in, that points elsewhere, a failing motor, a damper stuck closed, or a blocked duct if you vent outside. Not filter problems.
If the hood light quit and a new bulb didn’t fix it, or the speed controls act up (runs one speed only, won’t shut off), those are electrical faults inside the unit.
Same for any sparking, a burning smell from the motor housing, or a motor that labors on low. At that point it’s a repair-or-replace question.
For anything past the filters and basic cleaning, Bay Area Appliance Repair Service covers the Bay Area from the Tri-Valley to the East Bay. Schedule a visit and we can usually get out same or next day. $75 diagnostic, credited to the repair.