If it's any consolation Wii owners, one of my ps2's had the same issue. It would play dvd and cd games just fine, but DVD 9 games would not work at all and i'd get a disc read error. Good to see nintendo is going to clean your console, but if you live in a dusty house or with smokers it sounds like something that will be needed on a regular basis. with more games inevitably coming on DL dvds i wonder how widespread this issue will become.
Demon's Souls Official Thread | Currently playing: Left 4 Dead 2, LittleBigPlanet 2, Magicka