Free All is the very best penetrating oil I have ever tried, put something rusted in a rag and oil the heck out of it, let it sit for a week. Be amazed in how it penetrates and gets under the rust and lifts it off.
If you ever need help in getting off rusted on nuts and bolts, Free All will simply amaze you, and I have every super penetrating oil on the market I can find.
If you push a patch though a rifle barrel after shooting and let it set till you get home or a day or two later, the barrel will clean up much easier.
I don't work for Free All, just buy the stuff by the case.
