Mix a solution of 30% muriatic acid, 10-1 with water and soak your bolts. Some bolts will be clean in 30 minutes, some may take a couple hours.
Rinse them off good in clear water, then something like Castrol Super Clean and rinse again and dry quickly or they'll rust.
If you watch it closely, you can pull your bolts out before the acid eats the zinc coating off the fastener and they won't rust then.
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