how do you clean the grease filter on this thing? it seems stuck in there.

Diagnosis

The grease filters on the LG LMV2031ST are aluminum mesh screens designed to capture airborne lipids before they enter the blower motor. Over time, these filters suffer from "polymerized grease," where cooking oils undergo a chemical reaction with heat, turning into a hard, amber-colored varnish. This varnish acts like a powerful adhesive, bonding the metal filter frame to the plastic housing of the microwave chassis. When you attempt to pull the filter, you are fighting both the mechanical tension of the spring-loaded retention clips and the chemical bond of the grease. If you pull straight down without the correct pivot motion, you risk bending the aluminum frame or snapping the plastic tabs of the housing. You can confirm the filters are stuck by attempting a gentle tug; if there is zero "give" or play in the frame, the grease has likely sealed the perimeter of the filter.

How to Fix It

To remove the filters without damaging the unit, follow this precise sequence:

1. Open the microwave door fully to give yourself maximum clearance and visibility of the underside of the unit.
2. Locate the two small spring-loaded tabs on the sides of the filter frame. These are integrated into the housing and hold the filter flush against the ceiling of the vent area.
3. Place your fingertips on the front edge of the filter. Apply a firm, upward push—approximately 1/4 inch—to compress the internal springs and disengage the locking mechanism.
4. While maintaining that upward pressure, pivot the front of the filter downward toward you. The filter must tilt at roughly a 30 to 45-degree angle to clear the rear retention hooks.
5. Once the filter has pivoted down, slide it straight out of the tracks.
6. To clean, soak the filters in a basin of hot water mixed with 2 tablespoons of concentrated Dawn dish soap and 1/2 cup of baking soda. Let them soak for 30 minutes.
7. Use a soft-bristled nylon brush to scrub the mesh. Avoid steel wool, as it will shred the aluminum mesh.
8. Rinse with warm water and pat dry completely before reinstalling to prevent moisture from entering the blower motor.

If That Didn't Work

• Chemical Degreasing: If the filter is truly cemented, spray a heavy-duty citrus-based degreaser or a mixture of white vinegar and baking soda directly into the gaps between the filter frame and the microwave housing. Let it sit for 15 minutes to break the chemical bond before attempting the "push-up, pull-down" motion again.
• Thermal Expansion: Use a hairdryer on a medium heat setting to warm the edges of the filter frame for 2-3 minutes. This softens the polymerized grease, making it more pliable and easier to release from the plastic clips.
• Mechanical Prying: If the tabs are seized, use a thin plastic putty knife or a credit card to gently slide between the filter frame and the housing. Do not use a metal screwdriver, as you will gouge the white powder-coated finish of the microwave.
• Filter Replacement: If the mesh is clogged with carbonized residue that won't budge, the aluminum may have oxidized. Replace the filters with OEM LG parts to ensure the blower motor doesn't overheat from restricted airflow.

Heads Up

• Dishwasher Warning: Never put these aluminum filters in the dishwasher. The harsh detergents can cause "flash oxidation," turning the silver filters a permanent, dull grey or yellow.
• Airflow Maintenance: Clean these filters every 30 days if you fry or sauté frequently. A clogged filter forces the blower motor to work harder, which can lead to premature motor failure.
• Installation Check: When reinstalling, ensure the filter "clicks" firmly into place. If it is loose, it can vibrate during operation, creating a loud rattling noise.
• Vent Path: While the filters are out, use a vacuum attachment to suck out any loose grease droplets from the vent housing to prevent them from dripping onto your stovetop.