Originally Posted by Liberty Valence
Something with phosphoric acid is good for etching rust off of metal and it leaves a nice finish, too. That's what the body shops use to clean the panels before they paint (and they mix it with a little alcohol). Naval Jelly has phosphoric acid in it. So does Coca Cola...and yes, it works. You can also go to paint places and they sell prep solutions that are good for cleaning rust off metal...Dupont makes one called Quick Prep and Sherwin Williams has a product called Metal Prep. The nice thing about phosphoric acid products is that they etch rust fairly efficiently and they etch the iron very slowly, so if you need to let it soak on there for a while you can do it without ruining what's under the rust.
Rotfl. My grandfather had school buses, moving vans, and some assorted "heavy equipment." He cleaned rusted and greasy parts by boiling them in a big washtub of cola. My mother would never let us kids have Coke or Pepsi or any other cola when were were growing up. Said it was not fit to drink. When I went to work for a major chemical company, they made what was at that time the best can lining for colas. Said colas were their most demanding can lining of any foods or beverages, b/c the phosphoric would acid would eat just about anything. Lol