[Mike B]

Henry...I'd bet if you used the Evapo-rust in the engine and run it through while water was moving as well as it getting hotter, you'd not have had to wipe residue off/out of anything...but only concern I'd have doing this , is could any damage occur in the pumps?

Would certainly seem your tests show it's a much better product than vinegar...are there instructions on what needs to be done to neutralize it?