My cd player in my fiesta isnt working...it makes a wierd sound?

i want to get my cd player to work but when i put a cd in it makes a crunching sound then comes up with error 12.. But after reading the manual, error 12 means dirty cd but this happens with all my cds. what can i do, i have a feeling its because my cd player has clogged up with dust as it had been sitting on my drive for 2 months.. any1 have any ideas