Can you post a picture? "Discolored" to me is either some sort of calcium deposit or corrosion. And then, I'm not even sure if you should run like CLR through the block (never tried that before, this could be terrible advice).
[Waits for the generic "Dallas" answer when he really lives in some place like Richardson, haha]
I'm a Texas native residing in Arkansas. I used to give out the generic "Dallas" answer when I was in college.
A lot of unnecessary bashing in here for a cosmetic attachment. If you're into meticulous, photo-worthy cable management, this could be for you. If you're into logos on your parts/cases/accessories, this could also be for you. If not, that's okay too.
I personally think it's kind of cool, but since I don't typically buy secondary designs (Nvidia coolers for me ), I won't need one.