Recently i was given a RCA 52" TV, the guy said the screen "hour glassed" in the center, i got it home, plugged it in, turned it on, and the screen is fine. It may get bad later. My question is this, i took the bottom back panel off to see why there is no sound and found cobwebs and allot of dust. I noticed there is a thin layer of dust on the CRT lenses. I want to clean them but i am not sure how to get to them. I tried to pull the top back panel off but it seems like its "stuck" or attached somehow. I am going try to take off the front screen, but i want to make sure i don't screw anything up. Any help would be greatly appreciated.