I use alcohol and something soft. If the cd looks pretty bad then I use GameDoctor disc cleaner. Sometimes the GameDoctor helps out w/cd's that skip but it makes the cd look like there is nothing but a bunch of very very light scratches. About 2 years ago I barely had bought the GameDoctor and I was gonna sell a CD on the OG BART,I told Kokane that the CD was mint. Well the cd was kind of dirty so I used the GameDoctor and sent it his way. He got the cd and told me that the whole CD was full of scratches,and I told him they were probably just cleaning marks. Well he sent it back,nobody I showed it to ever noticed scratches on it,but I guess there was a lot of very very light scratches. Now if I told Kokane I had a cd for sale that he needed he would probably say:"I'm cool". So I wouldn't really recomend cleaners from the store,GameDoctor is okay if your cd already has a fair amount of scratches. I need the try that toothpaste thing.