Dirt and metal particles on your bike’s chain can accelerate chain and sprocket wear and cause shifting or other performance problems. Park Tool sells its Cyclone chain scrubber to keep your bike’s chain clean and operating at peak performance.
The scrubber fits over the chain, and a series of rotating brushes remove the grime from the chain as it passes through the Cyclone. As the chain exits, sponge material draws the remaining solvent from it. The reservoir holds plenty of solvent, and a magnet at the bottom removes metal particles from the fluid to keep them from getting back on the chain.
You can buy a kit with the Cyclone chain scrubber, gear cleaning brush, and cleaning fluid for $20 to $30 depending on the retailer.