Any restaurateur knows the importance of making a good impression with cleanliness. Plates and silverware should be spotless, restaurant glassware should sparkle. But it's not just what's on the table that matters: Wash your restaurant windows with methylated spirits ("denatured" alcohol) to bring out a shine and iridescence that you never knew they had! Methylated spirits are typically used as solvents and in camping fuel. Note that it is not the same as rubbing alcohol, which is ethanol made toxic and undrinkable.