How many of you guys and gals clean your glass while its still hot? I woke up this morning and I had that yucky white film on my glass from the previous nights low burn. It doesn't seem to always burn off with a hot fire. Sometimes I will wet a rag with windex and wipe it off, but only if the glass is not too hot. How hot is too hot? When I have a good bed of coals in there my glass is still very hot. I'd hate to risk cracking the glass. Can ceramic glass crack from the exstream temp shock from a wet rag? Any other ideas to clean hot glass. I heard of using ash, but that sound like it could possibly scratch? It usually doesn't bother me but da wife likes a clear view of the fire.