Got to ask the perpetual question that has hounded me for years. Just what is the best cleaning method for glow engines. I have serveral really nice engines that have over time gotten that glow fuel look. Has anyone ever found the best method of cleaning the brown stains off of an aluminum engine case. I have tried vertually every over the counted mixture known to man but have never found anything that really works. There must be some old timers out there that knows the best home brew mixtue.