When I have the time I'll just take the parts to my local anodizer, I just give him the parts and he takes them in to the back and dips them in caustic soda. It'll remove anything! But this time around I did this old trick that I learned back in the BMX days. Drano. It has to be the crystals version, not the liquid. I'm not sure if you have it in the UK. Some other crystalized drain unclogging solution should work. The key ingredient that you're looking for is lye. I took an empty paint bucket, put the parts in, filled it up with water about a third of the way, just enough to cover the parts. Then started adding the crystals teaspoon by teaspoon. I probably ended up with about a 1/4 cup of the solution. Make sure you do this in a well ventilated area and wear rubber gloves. The stuff if pretty toxic. I used a paint stick to stir the components around a bit. Next thing I know the water is starting to turn red. That's a good sign. I know it may seem sacrilege to some to strip a perfectly good component, but it wasn't doing me any good as red. And I'm sure I'll get a lot of enjoyment out of it in it's new appearance. I've done this before with many different components, and you'd swear they came from the factory like that.
Hope this helps.
looks super in alloy finish just laquer it 
