Let me start out by saying what not to use: Don't use the cleaning CDs that you can buy. Most of those have tiny brushes on them that could scratch the optics inside your CD player and make things worse. Your Denon CD player and similar pro grade DJ CD decks are a higher precision player than the average consumer CD player that those things are marketed towards.
Your solutions are these:
Find a vacuum cleaner with decent suction and use the hose attachment remove any dust or other debris that may be lodged inside the player by running the hose around the entire player (you'd be surprised where dust can lodge (and from where it can be dislodged).
You can use canned air... but two caveats: Canned air doesn't necessarily move the debris and occasionally when spraying it, you get bursts of moisture with the air. Obviously moisture inside your playe would be a bad thing.
Take your player to a reputable electronics repair facility and have it professionally cleaned and the optics adjusted.
I keep a microfibre cloth with me in the DJ booth and look at every CD before I put it inside my players (I have DN-S3500s) and if there's any grime, I use the cloth to remove it.
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hi if you have tried cleaning the lens gently .. then ... on these models the laser OPU oftern fails . so you will need to change the laser ..when you say will not read the cd does it try to spin or just sits there doing nothing.. i can provide replacement laser and service manual if you require them...yammandan