You must remember to re oil the gun after using brake cleaner. It removes all of the oil from the pours of the steel and can cause the gun to rust internally. (Even stainless steel.) This requires you to disassemble the gun to get at the internal parts and defeats the purpose of using the aerosol cleaner in the first place. I've seen a few police guns ruined by using gun scrubber type cleaners and then not properly lubing the gun. My advise is to stay away from this stuff all together. It's a lazy mans cleaner and ends up being more work than regular CLP or Hoppe's on a rag in the end.