How to Clean Grease From Vent Hood

Quick Answer

To clean a greasy vent hood, soak the metal filters in a mixture of boiling water, baking soda, and degreasing dish soap for 15 minutes. Scrub the filters with a soft brush and wipe down the hood canopy with a dedicated kitchen degreaser or a vinegar solution to remove sticky residue.

Grease buildup isn't just ugly, it's actually a fire waiting to happen. Seriously. I've pulled apart hoods caked so thick the motor was struggling to spin and the filters were basically kindling. Ignore this long enough and you're looking at a motor replacement that'll run you $200+, or worse, a grease fire that travels right up into your cabinets. Don't let it get there.

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Time to Fix

30–45 min

Difficulty

Parts Cost

$0 (no parts needed)

Tools Needed

Degreasing dish soap (like Dawn), Baking soda

How to Clean Grease From Vent Hood

OK so this whole job takes maybe 45 minutes and you probably already have everything you need under your sink. Baking soda, dish soap, hot water. That's basically it. I tell everyone to do this every two months, every month if you're doing a lot of frying. The filter's the main thing, but don't skip the hood itself or you'll just keep redistributing grease every time you cook.

Common Causes

You've been cooking without running the exhaust fan. Sounds obvious but I see it constantly. All that vaporized oil from your pan just floats straight up and coats every surface inside the hood.
High-heat cooking like searing steaks, deep frying, or stir-frying generates a ton of atomized grease particles that get pulled right into the filters. Do this a few times a week and your filters saturate way faster than you'd think.
Filters that haven't been cleaned in 6+ months. The mesh gets so clogged it can't catch new grease anymore, so the oil just bypasses the filter entirely and coats the hood interior and canopy.
The filter isn't seated correctly after the last cleaning. Even a small gap around the edges lets grease-laden air sneak past the mesh and straight into the motor housing. I replaced a motor last month because of exactly this.
Using oils with low smoke points like butter or unrefined olive oil at high heat. These break down faster and leave a stickier, harder-to-clean residue than refined oils.

Symptoms You May Notice

There's a thick, yellowish-brown sticky coating on the underside of the hood canopy, and sometimes it's actually dripping onto the stovetop.
Smoke hangs around your kitchen way longer than it used to after you finish cooking, which means the fan isn't pulling air like it should.
You smell something burning even when nothing's on the stove. That's actually the polymerized grease getting hot from the motor.
The fan sounds like it's straining or running louder than normal because the motor's working against a clogged, restricted filter.
Your cabinets near the stove are getting a greasy, sticky film on them because the hood can't capture cooking vapors anymore.

Tools Required for Diagnosis

Degreasing dish soap (like Dawn)Baking sodaSoft-bristled scrub brushMicrofiber clothsBoiling waterKitchen degreaser spray

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Frequently Asked Questions

Can I put my vent hood filters in the dishwasher?

You can, but honestly I'd avoid it. Most filters are aluminum, and dishwasher detergent is super alkaline. It'll oxidize the metal and turn it a dull, cloudy gray or even black over time. The filter still works fine after that, it just looks terrible. Hand washing with the hot water soak method takes barely any extra effort and your filters will stay shiny and new way longer. Save the dishwasher for your actual dishes.

How do I clean the charcoal filters in my vent hood?

You don't. Charcoal filters aren't washable. They're what ductless hoods use to trap odors instead of venting outside, and once they're saturated with grease and smells, they're done. Toss them and put in new ones. For the average home cook, plan on replacing them every 6 months. If you cook a lot, every 3 to 4 months. Check your hood model number for the exact replacement part, they're usually pretty affordable, like $15 to $30 depending on the brand.

Why is my vent hood still sticky after cleaning?

That's polymerized grease. Old grease that's been heated and reheated enough times basically turns into something closer to plastic than oil. Regular dish soap won't touch it. You need a heavy-duty citrus degreaser, or make a thick paste from baking soda and just enough water to make it spreadable. Apply the paste, let it sit for 30 minutes, then scrub hard. For really bad cases I've used a plastic scraper to knock the bulk of it off first before scrubbing.

Is it normal for grease to drip from my vent hood?

No, stop using the stove until you've cleaned it. Dripping grease means your filters hit maximum capacity and can't hold anything else, so oil's just running straight through. That's a serious fire hazard sitting right above your burners. Clean the filters immediately. And while you're at it, shine a flashlight up into the ductwork above the hood if you can access it. Grease pools up there too and you really want to know if it has.

How often should I actually be cleaning my vent hood?

Every 2 months for average cooks. Every month if you fry a lot or do a ton of high-heat cooking. I know that sounds like a lot but once you have a system down it's a 45-minute job. The problem is the longer you wait, the harder the grease gets, and what should be a routine cleaning turns into a real project. And your fan motor is what I'm really worried about. Those run $150 to $250 to replace and regular filter cleaning is basically the only thing keeping that motor alive.

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 17, 2026