How do you fix your PS2 if it wont read any PS2 games?

You might want to take it somwhere to be cleaned. I have the same problem but i am saving my money for a car and on vacation. onl;y a few of my games work. but it is better than none. maybe 10 of my 40 ps2 games work.... but i have one of the original in like 2003 or 2004.i hope i get a slim or something....