A friend of mine was over Saturday and we were cleaning his handguns (which had not been cleaned since we shot them Dec. 18/04, so nearly a month). I soaked his barrels with Butch bore shine, scoured them with nylon and bronze phosphor brushes and then ran clean patches through them until they came out clean. It took at most two rounds of soaked patches and brushing before patches were coming out clean. I said to myself, no way these guns are clean after the amount of shooting and then storage without cleaning. i looked in barrels and they looked good, but i still was not sure. Then, my friend said, lets lube up the barrels with this red, very thin oil like substance. The patches we used to coat the barrels came out BLACK!!!!!! So, we cleaned for a good long while with this stuff and patches came out black for a good long while. I got one of his revolvers sparkling with this stuff. I asked him what it was and he pulls out this red bottle called Marvels Mystery Oil. Apparently, its used to remove fowling and deposits in engines. you add this stuff to the oil and it cleans up the engine... the question i have is: has anyone used this stuff and is it safe to be used in gun barrels and parts. Are there any special precautions to be taken. i advised him to use a degreaser to remove all that stuff and then re-oil with a good gun oil, like Kroil.