Cleaning a Showerhead
Showerheads, like faucet aerators, in area with hard water will eventually become clogged with mineral deposits. Not all showerheads break down the same way. However, new showerheads come with a water-conservation device, called a flow restrictor, that cannot be removed.
Unscrew the swivel ball nut and remove the showerhead.
Disassemble the internal parts.
Soak overnight in white vinegar or a lime-dissolving solution
Reassemble the showerhead. Apply silicone grease to the shower arm threads and install the showerhead. Turn on the water and inspect for any leak.