Why Phoenix homes get so much buildup
Hard water carries dissolved calcium and magnesium. When it dries, those minerals stay behind as white spots and crust. In its 2023 water quality report, the City of Phoenix measured an average hardness of about 13 grains per gallon (around 229 mg/L). By the U.S. Geological Survey's scale, anything above 180 mg/L is considered very hard.
Add the dry desert air, which makes water evaporate fast, and you get spots on everything that gets wet.
What works, surface by surface
Shower glass
Spray a mix of white vinegar and water with a few drops of dish soap, let it sit for 10 to 15 minutes, scrub with a non-scratch pad and rinse well. Old, thick buildup may need several rounds.
Faucets and fixtures
Wrap the faucet in a cloth soaked in vinegar for about 30 minutes, then wipe and dry. For showerheads, many people tie a bag of vinegar around them. Check your fixture finish first: some brass, bronze and specialty finishes can be damaged by acid.
Toilet rings
For a stubborn mineral ring, a wet pumice stone works on standard porcelain. Keep it and the bowl wet the whole time, and never use it on colored, coated or scratched surfaces.
- Never use vinegar or other acids on natural stone. Marble, travertine and many granite finishes, which are common in Arizona homes, can be etched permanently.
- Never mix vinegar or other cleaners with bleach. Mixing them can release dangerous gas.
How to keep it from coming back
- ✓Squeegee the shower glass after every shower. It takes 20 seconds and prevents most spots.
- ✓Dry faucets after use with a microfiber cloth.
- ✓Consider a water softener if buildup returns within days.
- ✓Keep a regular cleaning schedule. Light buildup comes off easily. Months of it takes much longer.
When to call a professional
If buildup has been there for a long time, a deep cleaning is the right start. Fixtures, glass and grout get detailed attention, and heavy buildup can be booked as an extra so there's time to do it right.
Sources: City of Phoenix, 2023 Water Quality Report; U.S. Geological Survey, water hardness classification.