The Park Tool CM-5.3 Cyclone Chain Scrubber cleans bicycle chains quickly, easily, and effectively — without the hassle and mess of removing the chain from the bike. The CM-5.3 uses an extra-large solvent reservoir and a series of rotating brushes to get chains sparkling clean. A magnet at the bottom of the Cyclone’s solvent reservoir draws particles scrubbed from the chain, effectively keeping them from being redistributed onto the chain during cleaning. The durable sponge material draws solvent from the chain as it exits the Cyclone, reducing drips and mess. The brushes and sponge of the CM-5.3 are replaceable (part # RBS-5).