A soft / medium bristle toothbrush will do the trick. Make sure you put the rubber bits back correctly, though.

toothbrush and deionized water, failing that 99% alcohol.
£20 - http://www.overclockers.co.uk/showproduct.php?prodid=WC-104-MH
£3 - toothbrush and deionized water
£5 - toothbrush 99% alcohol
I've cleaned nickel plated stuff with isopropyl alcohol and it's been fine.

may try this then, when i get the block.![]()
Tbh that one doesn't look to bad. It doesn't look stained and probably needs a bit of a flush and that will do.
Just make sure to get the clean one and not the one that looks like a murder scene.
Remove the block top, toothbrush + white vinegar then give it a good rinse after.


Lol yeah the same mate the clear cheap stuff from your local shop will do. Dilute it a bit with water and give it a scrub![]()