BCB-4.2 Bike Cleaning Brush SetA clean bike is a happy bike! The Park Tool BCB 4. 2 is a four piece brush set designed specifically to clean bicycles. Ergonomically designed and featuring dual density, sure grip handles, the BCB 4. 2 includes a soft bristle soaping brush for general cleaning, a sponge bristle combination brush for heavy duty scrubbing, a tapered bottle brush for detailed cleaning of tight areas, and the GSC 1 Gearclean brush, with tough nylon bristles and a curved