Includes Muc-Off’s liquid Drivetrain Cleaner wash, the most powerful chain cleaner we’ve ever used, along with Muc’s self-contained brush system. Thoroughly wipe your chain and rear derailleur pulleys after using this system and you’ll have a chain that’s cleaner than new. Then reapply your preferred chain lube for a sweet, quiet ride. The X3 works great, and it actually makes chain cleaning fun!