The hardest bike parts to keep clean are the chain and other parts of the drive train-the pedals, derailleur, rear hub, and such-so tackle them first.
Protect your hands with work gloves.
Then apply a degreaser to a soft cloth and clean the chain a few links at a time, moving the pedals forward as you work.
Once you’ve cleaned the entire chain, carefully remove it from the chain ring (also called the chain wheel)-the metal wheel with pointed teeth that keeps the chain in place.
Using a small screwdriver, carefully remove any caked-on gunk caught between the teeth.
Then slip a cloth between them, rubbing it back and forth as if you were flossing your teeth.