Speaking as a retired auto mechanic (45+ years), I'd be more inclined to buy something that I know works off the shelf than to try wearing a chemist hat to achieve the same results. I watched that first video from your suggested search, and noticed he let the concoction he made work for a week to achieve what I believe PB would have done in a couple of hours. Liquid wrench was never a go to product for me, which is what he was comparing his concoction to.