Hard water stains can turn clear shower glass into a cloudy, streaky mess. They’re caused by minerals in hard water, mainly calcium and magnesium, which stay behind as chalky deposits when the water evaporates. They’re common in hard-water areas like Perth, and the good news is that most can be removed with patience and the right approach.
Understanding hard water stains
Fresh stains look like white spots or rings. Over time they join into a cloudy film, often mixed with soap scum. Left for a long time, mineral deposits can etch the glass surface. Etching is permanent damage, so it’s worth tackling stains early.
Stain or etching?
Clean and dry a small area thoroughly. If the mark is still there and feels smooth rather than chalky, it may be etching. Etched glass can’t be cleaned back to clear. A glass restoration specialist can advise on your options.
What you’ll need
- A sponge designed for shower glass, such as our Shower Screen Cleaner Sponge, which works with just water
- White vinegar and warm water
- A soft cloth
- A squeegee
- A microfibre cloth for drying
Step-by-step guide to removing hard water stains
Step 1: Rinse the glass
Rinse the screen with warm water to remove loose grime and soften the deposits.
Step 2: Wipe with water first
Wet the sponge and wipe in firm, even strokes, keeping water between the sponge and the glass. Work in small sections. Light stains often come off at this stage.
Step 3: Use vinegar on stubborn spots
For marks that won’t shift, mix equal parts white vinegar and warm water. Wipe it on with a soft cloth and leave it for a few minutes to loosen the minerals. Keep it off natural stone and never mix it with bleach.
Step 4: Wipe again
Go over the area again with the wet sponge. Heavy, long-term build-up can take a few passes, or a few sessions.
Step 5: Rinse thoroughly
Rinse the glass with clean water so no vinegar is left behind.
Step 6: Dry and polish
Dry with a squeegee, then polish with a microfibre cloth for a streak-free finish.
Always patch-test first on a small hidden area, take extra care with coated, tinted, frosted or acrylic screens, and never use sandpaper, steel wool or scouring powder on glass.
Preventing hard water stains
Squeegee after every shower
Removing water before it dries stops most new stains forming.
Consider a protective coating
Water-repellent glass coatings help water bead and run off. Check with your installer if your screen has a factory coating.
Clean weekly
A quick water-only wipe once a week removes minerals before they build up.
Look at water treatment
In very hard-water areas, a shower filter or water softener can help. Ask a licensed plumber what suits your home.
Ventilate
Run the exhaust fan and leave the shower door open so the glass dries faster.
Why a water-only sponge is a good choice
For regular upkeep, a water-only sponge means no products to buy, no fumes in a small bathroom and nothing to rinse off afterwards. It’s also easy to keep in the shower for a quick wipe.
Clear glass, made simple
Remove stains gently, dry the glass after each shower and give it a weekly wipe. If you’d like a simple tool for the job, try the Shower Screen Cleaner Sponge, a reusable 2 pack that cleans shower glass with just water.
