Oxalic acid.

When I was a kid, I used to go through old dumps out in the woods in search of old beer cans for my collection. I used oxalic acid that I bought from the local drugstore to remove rust on some that were worthwhile.

- Patrick

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1982 240D. 198k, Marine Blue/Blue, 4 Speed, Crank Windows, No Sunroof, No Rust, No Oil Leaks
2001 TDI. 197k, Lagoon Blue/Black, 5 speed, Chip, G60/VR6