Just like some of the others: Let the glass cool to ambient outside temperature. Use a razor blade to scrape off gunk. It's very easy, and very quick. A couple of squirts of windex, and wipe clean with paper towells. Now you have a perfect squeaky clean window. It really is quick and easy, and with a minimal amount of chemical. I clean my glass after every smoke. Some of that other stuff is just too caustic for what I'm going to eat out of in my opinion. I'm asthmatic, so this is how we have to do it.