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Dave had good luck with vinegar (might have been apple cider vinegar), and I've also heard good things about molasses.
I've used an environmentally-friendly chemical that is designed to remove lime, calcium and rust. It worked very well for me.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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