Recommend to be diluted. Highly concentrated BioTech Non Acid Wheel Cleaner was created to work like a strong acid. This is a non-acid, with no harsh effects that works great on wheels. Our non acid cleaner will make a quick work on getting rid of grime, brake dust, grease and dirt when applied to multiple surfaces. Work also on different surfaces like engines, floors, and whitewalls. Dilute up to 1-30 depending on degree of soils. Rinse away loose soils and spray Non Acid Wheel Cleaner thoroughly on wheels and rims. Wait about 30 seconds and flush with clean rinse water. Some brushing may be necessary for difficult to clean wheels.