I have some 99% alcohol from a drugstore (this is not rubbing alcohol, which has moisturizers added.) Would it be good for cleaning gunked-up PCV valves and the like? Or should I use a petroleum product such as diesel fuel? Is WD-40 any good for this kind of thing?
P.S., I know it's better to buy new PCV valves because they're usually cheap, but sometimes that just isn't an option.