Here are some steps you can follow to clean your faucet head:

1. Fill a plastic bag with half water and half vinegar, ensuring there is enough liquid to submerge the faucet head.
2. Put the liquid-filled bag over the faucet head and secure it with a rubber band.
3. Let stand for 30 minutes to one hour.
4. After soaking, scrub away any remaining dirt or buildup with a toothbrush and rinse with water.

Another method is to wet a cloth with vinegar and wrap it around the faucet head, then sprinkle baking soda on the cloth and scrub the faucet head gently.