It depends on if you are talking about wet pee or dried pee, and if it's just a bit of pee staining or like he sat in pee. If it's wet try wiping as much off as you can with a paper towel and then give a dust bath. If it's already dried and we are talking about pee stains then yes the dust will get rid of it over time, you can add about a teaspoon of corn starch into the dust to help if you want. If it's dried but more then just a stain you can use some unscented organic baby wipes then a dust bath.
Depending on why the chin has pee on it you will need to address that issue too.