If you mean the exhaust fan that is beneath the microwave, ours is a 'permanent' one- removable and washable.
Best way for me is: in a wash basin, with REALLY hot sudsy (like Dawn dishwashing detergent) & water. Agitate it a bit, let it sit for a bit. Grease will melt off. Can lightly scrub it without damage.
Rinse well in HOT water and let dry before returning it to it's position.
If you would rather replace it than clean it, you can probably order the part online, but as it might not meant to be disposable, it may be expensive.
If you mean a filter INSIDE the microwave itself, I am at a loss. A "change filter" sign - wow. Wonder what it would filter from inside the microwave?
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