Take some anodised bolts that you dont like the colour of, a tin cup, £2 worth of Caustic Soda crystals from the local shop and some pliers.
Mix about 1 part soda to 3 parts cold water in the tin, stir it up, chuck the bolts in then fish them out with the pliers after about 3 minutes taking care not to breath the fumes. Wash them off and there you go. Tasteful bolts.
Or you can try getting it off with the polishing wheel which will take ages, burn your fingers and you will probably loose at least one bolt as it gets ripped out of your grip and spat under the bench.
Dont ask about the blue bottle.