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Get some molasses from the local co-op, mix 9 parts water and one part molsses. soak the parts for a few days and test for rust removal. This process is slow but it takes ALL the rust off, even into the deep pits.
The nice thing is it enviromental frendly as you are just using a biodegradeable product.
Old engine restorers use this to get the rust off of old portable engine blocks.
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