The rifling in air guns is very easily damaged. Weed eater line, patches, and goo-gone is all you should need. Melt one end of the line and put a small knot on it. Point the other end, and push it thru the patch. Then then thread it thru the barrel, and pull the patch thru the barrel. Keep repeating till clean. Don't use petroleum solvents they can damage seals and o-rings.