So I am watching YouTube and this guy is testing all sorts of gun oils. He would burn some gun powder, on a piece of steel and then test different gun lubes and cleaners to see which one removed the burnt powder residue. I was bored yesterday so I tried this myself and found some interesting results. I tested lots of different gun lubes, home brew concoctions and firearm solvents that I had on hand plus some other oils and cleaners I had on the shelf too. The results were pretty amazing (to me). So to cut to the chase, plain old Valucraft brake fluid was one of the best at removing the burnt powder residue. Is there any reason you can think of NOT to use brake fluid to clean a barrel bore or firearm internals exposed to burnt powder residue? Would it attack aluminum, SS, poly frames or others parts? I would also assume its not safe to use on wood stock finishes.