To make a homemade anti-fogging glass cleaner try any one of the three following:
•rub a few drops of liquid dish washing detergent applied with a damp paper towel over the window (or)
•2 oz white vinegar to 1 quart tap water (or)
•1 oz. sudsy ammonia, 4 oz. rubbing alcohol, 1/4 teaspoon liquid dish washing detergent, 1 quart water