The CD did a great job cleaning the player in my car which I'd bought used a couple of years ago. It went from not being able to play CD's/audio cutting out in the middle of a track, to crisp and clear delivery without the need to replace the CD player. I did have to run it a few times given how old the player was at that point (14 years), but it got the job done and I was impressed. Dust and dirt from the years were brushed away from the lens over a few minutes and saved me buying a new CD player for the car.