The Drivetrain Kit™ brings you three of our most popular products in one convenient cleaning kit: The Grunge Brush™, EcoTech™ Bike Degreaser, and DRY Lube. The Grunge Brush™ is our most popular cleaning brush because it is super durable, and now even easier to use with a new ergonomic handle. It's stiff bristles break up grunge and grime. Use the u-shaped end to clean your chain and chainrings, use the tail-end to clean in your derailleurs and around the dropouts and between the bottom bracket and chainrings.