Anyone got a good guide on cleaning / shining up water blocks?
After 2 years of use my blocks have gone dull, black marks etc. Is there a way to clean them up and make them shiny again?
I've tried;
Boiling water + vinigar, lemon + salt and even Cilit Bang!
Cilit Bang worked the best, but there still marked and dull.
After 2 years of use my blocks have gone dull, black marks etc. Is there a way to clean them up and make them shiny again?

I've tried;
Boiling water + vinigar, lemon + salt and even Cilit Bang!
Cilit Bang worked the best, but there still marked and dull.

