I had a black 2008 d-max that i hand washed it for a year and got sick of it, so i took it to a new car wash down the road and used the "brush" on it. Well got home and looked at it in the sun and it had fine scratches all over it from the brush in just 1 wash,and i sprayed it off before i used it. So using the brush is fine but u will get fine scratches all over from it for sure!