Here's the lastest in derusting technology that I found here via the Yenko website:
http://www.safestrustremover.com/
Though it takes a long time to work due to the current temperature here (around 45 degress) it is rather amazing. I bought a 5 gallon can of the derusting liquid and just followed the directions. I borrowed one of those curved water tanks that you check leaky tires with, wrapped the back of the car in a plastic tarp and fed it into the water tank. I then filled the tank with the liquid and used a small pump I bought at Home Depot, (they are sold for clearing the water from pool covers), hooked it to a garden sprayer with some hose and let it run.
Here is how I set up the contraption:
here is the before picture showing the light scale behind the rear valance:
Here is the progess after 2 hours. You can see the shiny metal starting to reappear.
This is amazing stuff. It is not an acid, just some magical chemical compound accidentally discovered by the guy who owns the company. I stopped by his shop here in Jersey and bought the stuff directly from him. He said they originally were developing a non-toxic rust and scale cleaning process for use in the Holland and Lincoln Tunnels but it wasn't up to the Port Authority's specs so they didn't buy it. He had brought the excess liquid samples home and dumped them in a rusted barrel for disposal the next day. To his surprise, the next day the inside of the rusted barrel was completely shiny metal. And that's where he got the idea to use it on cars. Gotta love accidental discoveries. Isnt that how Silly Putty and plexiglass were both discovered: by accident.
I will let it run over night and update with more photos tomorrow!