If you can find a product called Maltby, it is a spray penatrent works wonders on rust! It even cleans tar and tree sap etc. off your paint. Funny thing it won't harm fine finishes but knocks the hell out of rust. Maltby is almost the most important tool in the box. It was carried in most parts stores in the 80's and now is hard to find, I have a source here in So Cal, if anyone needs help.

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Tim
300CE
280SE 4.5
Sandals (size 11)