how do i clean the lense? take it out of the cpu and open it up? ive never done it b4

Also i have those files music.mpq and etc...i have the game already installed on my computer its just my cdrom wont read the cds no more....and i followed all the instructions and it seems like its gonna load and it sorta does but it never really boots up so yea not a total faliure but i cant get on still which is still my main objective...so i have no idea whats up (edit i took the face off the cd drive and blew it out...nothing happened really.