I've been very impressed with the stuff. I used it on the rear irs hubs, but mainly on old tools and my truck parts. Even dunked the big powerstroke engine heads in the stuff. Works like magic. I did both heads like this and then sprayed them down with wd40 to prevent flash rusting.I haven't had the need to use Evaporust yet, but I am impressed with how well it cleaned that manifold. Looks like it is time for a replacement!