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Look up this stuff called osfo, its what I use. You put it on(its a liquid) and you let it sit in the sun for a while, then the rust is gone. It adds an ion or something. Its too early for me to remember but it makes quick work of removing rust
'73 2002 m20 turbo [sold] '87 rat rod 325is [couch modded] '91 vert [daily] '88 325is [spec build v1] '84 325 [spec build v2] '99 323i vert [sold]
Don't bother using organic solvents to remove rust, its insoluble for the most part. Poly ethereals like ATF brake fluids will be a bit better, but an aqueous solution of oxalic acid or something that can reduce then carry away is much better. Metal oxides = insoluble.
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