As to "plain ol' dihydrogen monoxide" I have to say that it seems to work for Brent. I have always mixed my H2-O with Mobil water soluble oil, the same stuff I use in my machines as coolant/lubricant, for a couple reasons. It leaves a thin layer of lubrication in the bore which can't hurt. It is also a very good rust preventative which again can't hurt either. I think it works quite well in the fouling control and accuracy departments also. YMMV