If you store your town bike outside at night, the chain and bike lock will rust more quickly. This is why it's important to clean and grease them regularly.   How to grease your chain Use the pedals to turn the chain and give it a "squirt" all the way along and through the gears.  How to lubricate your lock Hold it straight and "spray" into the lock. Then insert the key and turn it a few times. Wipe off any excess grease with a paper towel.    An "all-in-one" product is perfect for this!