I don't know how you feel about chemicals but a high grade paint degreaser works really good. A lot of the old undercoating is tar based and melts when you spray a little degreaser or lacquer thinner on it. Go over it with a red scotch brite while its wet and you'll get it really clean without putting a bunch of unnecessary scratches in the metal from a scraper. The key is keeping the solvent from evaporating while your doing it.
|