Years ago, when everyone burned leaves in the fall, I had a big pile of damp leaves I couldn't get lit. So I grabbed the mower gas can and dribbled some gasoline over the pile. When I tried my Zippo - the flint was gone. So I walked into the house. Grabbed some matches. Walked back out (giving the gasoline less than a minute to start vaporizing). The explosion threw me up in the air...I landed on my back ten feet away. Burned off my eyebrows and eyelashes. Later on, I read that one cup of vaporized gasoline has the explosive force of three sticks of dynamite. Was I careless? Sure. Am I very respectful of anything like gasoline since? You bet. No criticism of anyone, for using it to clean stuff. In liquid form, it works great. In vaporized form, you go boom.