I know alot of people like to use vodka or rum to clean their pipes, but I'm not much of a drinker. I've read that if I don't use a drinkable alcohol to clean my pipes that I should use a "non-denatured" alcohol. Where can I find this? I've already checked all the drug stores and X-marts. If I can't find it anywhere, should I use ethyl or isopropyl rubbing alcohol?