What to use to clean grease off the exhaust screen?
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Soak in a sink or tub full of water and Dawn dish soap!
you did take it off to clean, right? once this is off, Dawn or some type like this will cut the grease. if it is heavy, you can always take it outside and leave it in a soapy bath for a few hours to cut most of the work. still believe in elbow work, and it will get clean. best of luck...