Question often asked to plumbers:Why is there white buildup on my shower head?In addition to being unsightly, white buildup on a shower head can cause problems. The buildup is made out of mineral deposits, and it’s perfectly normal. It’s up to you to periodically clean your shower head to remove the buildup. The easiest and most effective way is by filling a baggie with vinegar and tying it so that your shower head is submerged in vinegar. Leave it on overnight, and then scrub the shower head with an old toothbrush the next day.