First, let's clear up your thinking. You don't need to worry about the solution being "non-conductive" because the board is powered off. Second, distilled wat

First, let's clear up your thinking. You don't need to worry about the solution being "non-conductive" because the board is powered off. Second, distilled water isn't going to have much cleaning power. Most PCB cleaners are pretty toxic because they're trying to remove things such as solder flux and resin. The easiest solution you could do is to run your board through your DISHWASHER. Yes, that's right. Lot's of small board houses will do this and they turn out clean as a whistle. http://www.vintage-computer.com/vcforum/archive/index.php/t-15371.html http://www.vintage-computer.com/vcforum/archive/index.php/t-... Good luck!