Remove the showerhead. Refer to your user’s manual for specific removal methods. It usually requires twisting the showerhead in a counterclockwise direction to get it off. A wrench may be necessary at first to loosen the showerhead from the pipe.
Boil a vinegar and water solution in a sauce pan large enough to accommodate the showerhead. Use approximately 1 cup of white vinegar for every 2 quarts of wate to effectively remove lime from a metal showerhead, suggests Keene State College.
Submerge the showerhead carefully into the boiling water and simmer for at least 15 minutes to give sufficient time for the lime deposits to dissolve.
Remove the showerhead carefully from the hot water with a pair of tongs and rinse it under cold running water. Attach the showerhead back to the pipe, twisting it in a clockwise direction until it is tight.