WD-40 is a penetrating oil. It's pretty decent at that[1] and not badly priced. It's a pretty "middle of the road" product at its intended purpose: displacing w

WD-40 is a penetrating oil. It's pretty decent at that[1] and not badly priced. It's a pretty "middle of the road" product at its intended purpose: displacing water and rust to loosen stuck fasteners (and other items). [1] https://www.youtube.com/watch?v=xUEob2oAKVs https://www.youtube.com/watch?v=xUEob2oAKVs