----- Original Message ----- From: Louis Brydon <brydon@icarus.ssd.loral.com> > > DNA = DeNatured Alcohol, standard solvent available at hardware stores > (Also used for stove fuel) > IPA = Iso-Propel Alcohol (more expensive, not as available, works too) If you check with industrial solvent jobbers, I believe you'll find that isopropyl alcohol is both cheaper and more abundant than denatured ethyl alcohol. It is true that "electronic grade" IPA is a bit harder to find and more than a bit more expensive but in the context of cleaning props, shafts, and through hulls, the extra purity of "electronics grade" over "industrial grade" isn't needed. I believe (but I'm not 100% sure) that IPA is a somewhat more powerful solvent than DNA. The nice thing about alcohol as a cleaner is that it will remove dirt as well as grease unlike many petroleum based solvents that often leave parts fully degreased but still dirty. BTW: For those that are unfamiliar with these types of materials, it's important to remember that most of them can be very toxic and that they can enter your system in a variety of ways. Gloves, eye protection, and good ventilation are the order of the day. Cautiously yours Alex