• Mix equal parts of white vinegar and distilled water into a spray bottle. Shake the bottle to combine them thoroughly.
• Spray the mixture directly onto the calcium buildup and let it sit for several minutes; about 5 minutes is recommended. Depending on the amount of calcium present, you may need to let it sit longer or spray again a second time. 
• After letting the mixture sit for several minutes, clean the shower with a dry rag. You should see a noticeable improvement in areas of calcium buildup.
• For more extensive or stubborn calcium buildup, use a scrub brush and gently scrub the area before wiping clean.

For cleaning the shower head

• Fill a gallon-sized zippered bag with about a cup or two of straight vinegar. 
• Position it around the shower head until the sprayers are submerged. 
• Secure it with rubberbands and leave it to sit for at least an hour or up to overnight.
• Remove the bag and run your shower for several seconds to wash out the loose mineral buildup in your shower head.