I dip those pesky red or blue anodized fittings in DRANO CYRSTALS and WATER mixed up in a plastic bucket - only takes a very small amount to do one or two at a time... but you can only use CRYSTAL drano... it's sold in a small black can with a red plastic lid. About $3 for a can of it.
Dunk that fitting in there hanging off a piece of welding rod - swish it around and rinse it off in fresh water - and polish it right up.
If you make the solution too strong - it will fizz and boil and you better be quick on your dip! Also DO NOT PUT THIS CLOSE TO YOUR FACE either - the fumes are more than nasty! Make it too weak and it takes forever... after a couple of batches you'll get the hang of it.
EEEEEEEEHHHHHHHHHAAAAAAAAAAAA
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