How can I effectively clean and lubricate a rusty bike chain and gears to ensure smooth and efficient performance?

To effectively clean and lubricate a rusty bike chain and gears, follow these steps:

1. Remove the chain from the bike and soak it in a degreaser solution to remove dirt and rust.
2. Scrub the chain with a brush to remove any remaining debris.
3. Rinse the chain with water and dry it thoroughly.
4. Apply a lubricant specifically designed for bike chains to ensure smooth operation.
5. Reinstall the chain and test the gears to ensure they are running smoothly and efficiently.