cd R and RW problem

[gdatuk]

i have a liteon CD- R and a Benq CD-RW
over period of time..both these are becoming useless
they are not reading(let alone writing) and CDs
what do u think is the problem?
do they need lens cleaning?
or lens problem?
shall i ditch them both and get a sony combo drive?

[club_pranay]

prolonged exposure to Moisture/dirt/heat may make cd's unreadable. try using a new clean disk.

benq CD-RW's are quite reliable, they usually dont ditch you