Open the showerhead holes by soaking the head overnight in a vinegar bath and poking the loosened mineral scale free with a toothpick. Rinse the showerhead in tap water, then reinstall it by applying Teflon tape to the wall pipe threads, screwing it on and tightening it by reversing the technique in Photo 1. Complete the repair by turning on the cold water in the shower and blasting out any remaining mineral gunk.
Over time, hard-water minerals in tap water build up and clog the spray holes in showerheads. Fix this problem by removing the showerhead and cleaning it. Buy a lime removing product to loosen the scale, or soak the head overnight in vinegar (either white or apple cider). Check the owner's manual or manufacturer's Web site to confirm that vinegar won't harm the finish.
Carefully remove the showerhead and open the holes using the steps shown in Photos 1 and 2. If the showerhead is too stuck to remove, try filling a plastic bag with vinegar, tying the top of the bag around the top of the showerhead and submerging it overnight in the vinegar.