WD-40??? You don't like your anime dvd's?
What zrdb said is the way to go if you want to clean your discs. While i rarely buy used dvd's, i do come across a deal now and again on them (anime and non-anime), that's usually how i clean them and it works pretty good (tho i don't use the alcohol too often, mostly on the really stubborn stuff).
"There's no medicine to cure idiots." - Natsumi Tsujimoto