As far as I know, the CCD never needs cleaing....the dirtier it gets, the better it works. I've only ever had one. It's been used for the last two years on cars that are relatively clean (little bit of dust). If you can wash them, you might have to reapply the parafin wax. I think for the trouble/money involved, it would just be better to buy another one. If anyone else know's how to wash them, please post as the info I put here is from what I know about detailing (which compared to most autopians, isn't that much).