As stated above, buy a couple of cans of computer cleaner compressed air. You should be able to find it at Wally-Mart, Best Buy, or Radio Schack. It comes with a tube like WD-40 and you can direct air around through the slot. I have a CD with a pad on it that you put some solution on too, but I've never tried it in the HD CD player.

 

I must be one of the lucky ones. I purchased a SG in March of 2008 and inserted a CD that I made into the radio. When I traded this bike in November 2013 I removed the CD that was playing fine and still is playing in my new ride.

Now that I have given it such praise, when I go out to the bike the CD might be sitting there giving me the finger and never play again.