Kroil
Kroil (The Oil that Creeps) is used by the most accuracy-obsessed benchrest shooters to keep their barrels clean. Kroil creeps below the fouling in your barrel, allowing you to knock it out easily with a patch or brush. Kroil also displaces moisture, dissolves and prevents rust and can even be used as a lubricant.
http://www.midwayusa.com/viewProduct...tnumber=137203