In an ?ideal? world, there would be no dust. In the real world, however, your game discs get dirty. Your CDs get dirty. Your DVDs get dirty... and then you RENT games and DVDs? (After that kid down the street that has gone through four PlayStations already because he doesn?t know how to take care of one?!) The point is you put these discs in your PlayStation, you set them spinning at high speeds, and then you take them out when you?re done. Some of that dust comes off and lands on your optics. Over time, you develop a nice little film of dust and grime on your lens -- then (surprise!!!) your PlayStation won?t play some of your games... or it won?t play sometimes... or it will skip or hang up at some point. What can you do? Clean your lens... but you have to be careful about how you do it.