Park's Chain Gang contains everything needed to quickly and easily clean chains, cassette/freewheel cogs and chainrings so that your shifting works perfectly and your parts last and last. You get Park's Cyclone Chain Scrubber, GearClean Brush, and their CB-2 Citrus ChainBrite (8-ounce bottle). Simply fill the Cyclone Chain Scrubber to the line with ChainBrite, snap the cleaner onto the chain, hold the cleaner's handle and pedal your bike by hand. Like magic, the brushes inside the cleaner turn and scrub the chain clean (a magnet in the bottom retains any metal bits that come off the links). Then to finish the job, simply use Park's brush and some rags to clean the cogs and chainrings.