[header] How to clean a grease filter [title] Make sure the appliance is turned off and cool. [step] If you're removing the grease filter from a range hood, make sure the ventilation system is off and the surface is cool to the touch. If it's cool, any grease deposits will be hardened and easier to remove. 
[substeps] Some microwaves also have grease filters. If you're cleaning a microwave filter, unplug the appliance before removing the filter.