When using LSWC a few passes with Chore Boy and a bronze brush work fine for my 1911. With the Poly coated lead I've tried soaking in Kroil, Lewis lead remover, and scrubbing with Chore Boy. I eventually get it cleaned up but my concern is barrel wear. One thing I didn't try is the 50/50 mix of peroxide and vinegar, but that would have been next if I hadn't finally used up those 2,000 bullets.