I would say that if you can dis-assemble the unit down to where you can access the lens try using canned air first. Then if no progress is made try a water moist Q-Tip and extremely gently wipe it down. I would be carful with the alchohol as it might dry out the lens membrane to much and cause future cracking. If these procedures don't work then
I would say it is a laser adjustment and at 350.00 for a player and a minimum of 125.00(est) to repair it, I would see how it fits in a dumpster.