Best Rust Penetrator?

[mdwilf]

PB Blaster is pretty good, Deep Creep (I think by Seafoam) is great.

Vinegar works great for de-rusting parts, never thought of trying it for a stuck bolt. By the way, if you soak things in vinegar, you need to have some water & baking soda ready to dip the parts in the kill the acid from the vinegar, then be ready to treat the part with Rust Mort or something - the vinegar strips the metal & it will flash rust very quickly - within minutes.