I like my microwave clean.  At all times.  Period.  It is definitely my quirkiest cleaning habit, but I can NOT stand having any sort of food on any surface of my microwave.  I think this plate cover changed Hubby’s life when we discovered it, since he really hated covering his food with plastic wrap.  He covers his food, my microwave stays clean, and we’re both very happy!  It was $4 or $5 at Bed Bath & Beyond.