answer:Hm, I’m not sure about smoke, never tried before… With baked-on-food, I usually putting a dish of water in the microwave for a long time—enough time for the water to steam up the inside of the microwave and start softening whatever is stuck on the sides. Sometimes I have to do that several times, getting of the stuff layer by layer. Maybe that will work with the smoke? You could also try baking soda or vinegar to see if either cuts the smoke? I use baking soda to whiten out my tea-mug, and sometimes to get water stains off my glass, and it works like a charm in both cases—no apparent scratching… I think it’s fine-ground enough to not be overly abrasive on the surface. Then I use vinegar sometimes to help lift difficult substances off surfaces… And, since baking soda and vinegar are both edible, any leftover residue-turned-fume is fine.