It depends on what I am cleaning ? Rifle bores with copper fowling the form cleaners, Brush Out or all the copy's work great, pistols, shotguns, muzzle-loaders Ballistol, I do use CLP for rust and 4 00 steel wool, for heavy cleaning. For something that's stuck and won't move Kroil but it stinks to high heaven, but it will come out if you let it seat. Same with Shooters Choice a heavy cleaner.