To clean a shower head, follow these steps:

1. Turn off the water: Make sure the shower faucet is turned off to prevent water from running off while you are cleaning.
2. Remove shower head: If your shower head is removable, unscrew it from the pipe. Usually you can do this manually, but you may need to use a wrench or the appropriate tools if it is very tight.
3. Prepare a cleaning solution: Prepare a cleaning solution that is safe for use in wet environments and on materials such as stainless steel, chrome, or plastic. You can use a mixture of warm water and mild soap or a specific bathroom cleaner. Avoid using overly harsh or abrasive cleaners, as they may damage the showerhead.
4. Submerge the shower head: If the shower head is small and can be completely submerged, do so in a detergent solution. Let the showerhead soak for at least 15-20 minutes to soften and remove limescale and other deposits.
5. Brush or scrub: Use a soft-bristled brush or nonabrasive sponge to gently scrub the surface of the showerhead. Be sure to reach all cracks and crevices. To remove limescale, you can also use an old toothbrush or a kitchen brush to reach the hard-to-clean areas.
6. Rinse well: Rinse the shower head thoroughly with warm water to remove all detergent residue and dirt.
7. Dry the shower head: Use a clean cloth or towel to dry the shower head completely. Ensure that no water residue remains on the surface to prevent new scale deposits from forming.
8. Put the shower head back in place: Reinsert the shower head into the pipe and make sure it is secure.
9. Do regular maintenance: To prevent scale and dirt from building up in the future, clean the shower head regularly, at least once a month, or more often if you live in an area with hard water.

Always remember to follow the manufacturer’s instructions and to use products and cleaning methods that are safe for your showerhead material.