I read somewhere here that you should soak new stuff in vinegar to remove any crap that may have stuck during the manufacturing process..

Well now I know that's the worst advice ever, I soaked both waterblocks overnight and now they have some bacteria or corrosion or something on them. They're both copper, they have some green-blue crap and the surface is no longer as smooth as it was

What the hell can I do about this? And why did it happen?!