why does my cd player read bad disk

Hello, You can try to spray the CD player out with a can of air duster, but make sure you don't turn it upside down or spray into the slot for too long at one time. It can cause moisture to build up. Stick the straw into the CD slot, and spray in all directions. If it is dust, it will clear it out for you. If that does not work, the CD player will likely need to be replaced, or the CD is bad (not to insult your intelligence).