I use Isopropyl (Rubbing Alcohol) and Ethanol (what some people call PGA), I'm wary of denatured Alcohol, although I have plenty of it around, there's no real QC that goes into it and no way to be sure of what it's actually denatured with. In theory it's all volatile enough that it would evaporate.
Isopropyl seems to act as a better solvent and often breaks down things Ethanol can't, when I use it I follow up with a water rinse and a soak in Ethanol. As someone mentioned the volatility is nice as it dries very quickly.