You take off the filter or fan from your range hood, and there it is: thick, sticky grease. Ever found yourself thinking, “I’m scrubbing and it still won’t come off”?

Grease around the kitchen exhaust fan builds up little by little from cooking fumes. Over time, it hardens into a stubborn, gummy layer. Once that happens, dish soap and a regular sponge usually aren’t enough.

The good news: if you know how to pair the right cleaner with the right soaking method, you can loosen greasy buildup without exhausting yourself scrubbing. Based on information current as of March 2026, this guide explains how to clean each range hood part and how to keep grease from coming back so quickly.

Why Is Range Hood Grease So Hard to Remove?

When you cook, oily steam gets pulled into the range hood and sticks to the filter and fan. At first, that oil is relatively thin. But as it mixes with dust in the air, oxidizes, and polymerizes, it changes from sticky to hard and resin-like.

According to 花王’s official website, grease gets harder over time, making it difficult for regular neutral dish detergent to break it down fully. In other words, the longer you leave it, the harder the job gets.

The key is combining an alkaline cleaner with hot water. Alkaline cleaners help break down oil through a process called saponification, and when paired with water around 104–140°F, they soften hardened grease so it comes off more easily.

Before You Clean: Removing Parts and Getting Ready

Range hood cleaning starts by removing the parts you can safely take out. A typical range hood has three main areas.

  • Filter, usually the mesh part under the baffle plate — many types simply pull out from the front
  • Sirocco fan, the cylindrical fan inside — usually removed by turning the center screw; on many models, it loosens by turning clockwise
  • Hood body and inner panels — these usually stay in place and are wiped clean

* Removal steps vary by manufacturer and model. Always check your owner’s manual. If you don’t have it, you can often find it by searching the model number on the manufacturer’s official website.

What You’ll Need

  • An alkaline cleaner, such as baking soda, sodium sesquicarbonate, or OxiClean
  • Hot water around 113–140°F
  • A large trash bag, or a plugged sink filled with water
  • An old toothbrush and a sponge
  • Rubber gloves, which are essential because alkaline cleaners can irritate your skin

How to Soak-Clean Each Part

Cleaning the Filter

The filter collects the most grease. When grease clogs the mesh, ventilation performance drops fast, so cleaning it once a month is ideal.

  1. Fill the sink with hot water, around 113–140°F, and dissolve 3–4 tablespoons of baking soda or 1 scoop of OxiClean
  2. Submerge the filter and soak it for 30 minutes to 1 hour
  3. Gently scrub the mesh with an old toothbrush; the loosened grease should come off without much force
  4. Rinse thoroughly with hot water and let it dry completely

According to LION’s official information site Lidea, soaking becomes less effective once the water cools down. Add more hot water partway through, or place the parts in a large trash bag to help retain heat.

Cleaning the Sirocco Fan

The sirocco fan is a cylindrical fan with many narrow blades, which makes it especially easy for grease to get trapped in the gaps. A good cleaning schedule is once every 3–4 months.

  1. Spread a large trash bag in the sink, add hot water around 122–140°F, and dissolve an alkaline cleaner
  2. Place the fan in the bag and soak it for 1–2 hours
  3. Clean between the blades with an old toothbrush or bamboo skewer
  4. Rinse with hot water, dry thoroughly, and reinstall it

For stubborn grease, sodium sesquicarbonate or alkaline electrolyzed water can work better than baking soda. According to くらしのマーケット, sodium sesquicarbonate is roughly 10 times more alkaline than baking soda, making it well suited to hardened grease.

Cleaning the Hood Body and Inner Panels

Since the hood body usually can’t be removed, clean it by wiping.

  1. Dissolve an alkaline cleaner in hot water, then soak paper towels in the solution
  2. Press the paper towels onto greasy areas and leave them for 15–30 minutes, like a compress
  3. Peel off the paper towels while wiping away the loosened grease
  4. Finish by wiping with clean water, then drying with a dry cloth

According to コーナンTips, you can use a melamine sponge on stainless-steel inner panels, but be careful on painted surfaces because it may scratch the finish.

Choosing a Cleaner: Baking Soda, Sodium Sesquicarbonate, or OxiClean?

If you’re wondering which cleaner to use, here’s the simple version.

CleanerAlkalinityBest ForNotes
Baking sodaMild alkalineLight to moderate greaseSlightly abrasive. Best used mainly for soaking
Sodium sesquicarbonateMedium alkalineModerate to stubborn greaseDissolves easily in water and is easy to use
OxiCleanMild alkaline plus oxygen bleachGrease, sliminess, and yellowingDissolve in hot water. Never mix with chlorine bleach
Alkaline electrolyzed waterStrong alkalineStubborn greaseNo second wipe needed, but don’t use it on aluminum

In short, remember this: use baking soda for lighter grime, and sodium sesquicarbonate or alkaline electrolyzed water for stubborn grease. Also check the material first, because soaking aluminum filters or fans in alkaline cleaner for too long can cause discoloration.

5 Tips to Prevent Grease Buildup

The easiest way to make cleaning less painful is to stop grease from building up in the first place. Try these five prevention habits.

  1. Use disposable filter covers — Nonwoven filter covers from dollar stores or home centers can greatly reduce grease sticking to the main filter. Just replace them every 1–2 months
  2. Always run the exhaust fan while cooking — It sounds obvious, but if you skip it because you’re “only cooking for a minute,” oily steam spreads through the whole kitchen
  3. Keep the fan running for 5–10 minutes after cooking — Greasy steam can linger right after cooking. Letting the fan run a little longer helps prevent oil from sitting inside the hood
  4. Wash just the filter once a month — Taking everything apart for a deep clean is a lot, but the filter alone takes about five minutes. That alone can dramatically reduce grease reaching the fan
  5. Wipe the outside of the hood once a week — Spray alkaline electrolyzed water after cooking and give it a quick wipe. If the grease hasn’t hardened yet, it comes off almost instantly

FAQ

How often should I clean my range hood?

A good rule of thumb is once a month for the filter and once every 3–4 months for the sirocco fan. If you use disposable filter covers, cleaning the fan about once every six months is usually fine.

Should I use baking soda or sodium sesquicarbonate?

Use baking soda for light everyday grime, and use sodium sesquicarbonate for stubborn grease that’s been sitting for several months. Sodium sesquicarbonate dissolves more easily than baking soda, so it’s also convenient as a spray.

Can I use alkaline cleaner on an aluminum filter?

Avoid long soaking. Aluminum is sensitive to alkaline cleaners and may discolor or corrode. If your part is aluminum, soak it with neutral detergent instead, or limit alkaline soaking to a short time, about 15 minutes. Check the material in your owner’s manual.

How much does professional range hood cleaning cost?

As of March 2026, range hood cleaning through services such as くらしのマーケット typically costs around ¥10,000–¥20,000 in Japan. If you haven’t cleaned yours in over a year or you’re not confident taking it apart, hiring a pro is a reasonable option.

Can I soak range hood parts in dishwasher detergent?

Dishwasher detergent is highly alkaline and can work well on grease. You’ll even see people on social media say their exhaust fan parts came out spotless after soaking them in dishwasher detergent. However, some products contain abrasives or bleaching agents, so check whether they’re safe for the part’s material before using them.

References