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When I do it, I add a tablespoon or two to a gallon of water. Remember to keep the clamps for the battery charger out of the water or it'll mess up the metal. You'll also need to paint whatever you remove the rust from pretty quickly - the steel is ready to oxidize right away.
This has been by far the most effective way I've come across to clean rust out of deep pits. As long as you prime whatever you treat quickly you'll have great success in keeping your stuff from re-rusting.
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'87 924S (Sold)
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