I tried to use cleaning CD to the DVD drive on my computer which is no longer able to read two layers discs (it can read CDs and single-layer discs). I tried to clean several times with no significant effect: DVD still not working. I'm not sure that the cleaning liquid does '' not everything. When you put the disc in the drive, it rotates so fast that all the liquid vaporizes next door. Maybe this can work in some cases - but I guess the situation is rare.