Wd-40

old mechanic told me PB Blaster is the same stuff with a little acid added. I seen guys wiping their cars down at shows with it. HF sells it in 1 gallon cans for ~$24. Its also shows up now and then at .99 only stored in the 3oz cans. I usually buy 2-3 then. They have a "rust release penetrant" variant now. Brew 102 had the same story, perfected after 101 brews.....