It's ok. Not great. For it to work the car has to be completely cool. If you try to use it when the car has been in the sun, the brush smears wax or something like that and it's hard to get it off the finish. Along with that, it spreads lint all over the car, and you have to get a cloth, to try and wipe it off. I am not a fan of the duster.  If you want to clean your car, get a cloth and some detail spray. It works better and you will be happier with the results. The cal duster is too much effort.