You try cleaning it with lens cleaner but chances are you will have to buy new lens and laser you can find them on ebay use micro fiber cloth and be gentle
How Do I Fix A Playstation 2 Scph-70012-slim-the Disc Will Not Read?
This means that your Playstation 2 Scph 70012 slim model's lens as well as the disk function have become damaged.You will have to get them repaired from a professional since it can be further damaged if you try to repair them.
