Unblock your U-bend

And de-bling horrible anodized parts. This is a trick I learnt from home economics evening classes at Eat The Rich. Thanks Pete I tried this today. Beware! the fumes are very powerful even outdoors. I chucked the leftovers down the drain and my smeggy old grate looked brand new after its chemical death wash. BP
BEFORE:Take some anodised parts that you dont like the colour of, a tin cup, £2 worth of Caustic Soda crystals from the local hardware shop and some pliers.
Mix about 1 part soda to 3 parts cold water in the tin, stir it up, chuck the bits 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 bits.
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/finger/part, as it gets ripped out of your grip and spat under the bench.
AFTER: