~via BB (wap.pinstack.com)
I can get you a link to a guide when I can get to my PC. Just to warn you though it will never be white again. The only reason I would take it out and clean it would be because it wouldn't scroll in a particular direction. You can take out the whole asembly and soak it in hot water and dish soap, but it won't get it any whiter.
Ill post a link to a guide when I have a chance.