Scrubbing dirt from your tires and cassette after a long ride can be a chore, so Muc-Off designed a specific brush to help make the job a little easier. Stiffer-than-average nylon bristles make short work of any grime your bike has picked up from the road or trail. Simply spray some of the pink Nano Tech Bike Cleaner on the affected areas, agitate with the Tire & Cassette Brush and rinse. NB: To maintain performance of all brushes avoid use with boiling water and on hot parts. We recommend using warm water and allowing all hot parts to cool before use.