To remove hard water stains from shower glass, spray it with a 50/50 mix of white vinegar and water, leave it for an hour, then wipe with a damp microfibre cloth and rinse; rub a halved lemon on thick spots first. This is the method Wessex Water recommends. Keep vinegar off natural stone around the shower, never mix it with bleach, and squeegee the glass after each shower so the stains don’t come back.
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The white haze on shower glass is mostly calcium carbonate left behind when drops of hard water dry. Because it’s a mineral deposit, scrubbing alone barely touches it; a mild acid dissolves it. Below: the step-by-step method, what to do with stubborn or etched glass, and how to keep it clear.
Step by step: vinegar spray method
- Mix the spray. Fill a spray bottle with half white vinegar and half water.
- Pre-treat heavy spots. Rub thick patches with half a lemon and let the juice soak in, as Wessex Water suggests.
- Spray the glass until it’s evenly wet. On a vertical screen, spray from the bottom up and re-spray any areas that run dry.
- Leave it for one hour. The acid needs time to react with the scale. On very thick deposits, lay paper towels soaked in the mix against the glass so it stays wet.
- Wipe with a damp microfibre cloth, using a non-scratch sponge on any remaining spots.
- Rinse with clean water and dry with a squeegee or a dry cloth, so the rinse water doesn’t leave new spots.
How much vinegar does a shower screen need?
Each acid molecule can only dissolve so much scale. By the reaction ratios, one cup (237 mL) of 5% white vinegar can dissolve at most about 9.9 g of calcium carbonate, so a cup of the 50/50 spray can dissolve about 5 g. A hazy film on a shower screen weighs far less than that, so a bottle of spray is plenty; the limiting factor is contact time, not quantity. If you see fizzing stop and haze remains, re-spray rather than scrubbing harder.
Stubborn stains: what to try next
| Step | What to do | Why |
|---|---|---|
| 1 | Repeat the vinegar soak with paper towels held against the glass | Longer wet contact on thick spots |
| 2 | Use citric acid solution instead of vinegar | Gram for gram it dissolves about as much scale, without the smell |
| 3 | Use a shop-bought limescale remover made for glass | Stronger acids work faster; wear gloves and read the label, as Which? advises for descalers |
| 4 | Accept that some marks may be etching | If nothing changes after several treatments, the glass surface itself may be damaged |
Run a fingernail over a stain that won’t shift. If it feels rough and raised, it’s still deposit. If the glass feels smooth but stays cloudy, the surface is probably etched, and no cleaner will make it clear again.
Safety and surfaces to protect
- Never mix with bleach. The New Jersey Department of Health warns that bleach mixed with an acid such as vinegar releases chlorine gas, which can burn the eyes and lungs. Rinse away any bleach-based shower cleaner before using vinegar, and ventilate the room.
- Protect natural stone. Marble and limestone around a shower are calcium carbonate too. Stone-care maker Fila warns that vinegar, lemon and limescale removers can dull polished marble or leave rough white marks. Cover or avoid stone trays, sills and tiles.
- Check coatings and frames. Some screens have a factory water-repellent coating, and frames may be coloured or plated. Check the care instructions before using anything acidic.
Keeping shower glass clear
Hard water stains form where drops evaporate, so the most effective prevention is not letting them dry on the glass:
- Squeegee after every shower. Ten seconds, and most of the minerals go down the drain instead of onto the glass.
- Wipe weekly with the vinegar spray before haze builds up, when it comes off in minutes.
- Ventilate so the glass dries evenly.
- Consider the water itself. How fast stains return tracks your hardness: in a very hard area such as Las Vegas at 16 gpg they come back within days. A whole-house softener removes the minerals before they reach the shower; see do I need a water softener.
Frequently asked questions
Does vinegar damage shower glass?
Plain glass tolerates diluted white vinegar. Take care with stone surrounds, special coatings and coloured or plated frames, and follow the screen maker’s care instructions.
Why do the stains come back so quickly?
Because every shower deposits a little more mineral. The harder your water, the faster it builds up; check your figure on the water hardness scale.
Can I use baking soda?
Baking soda is mildly abrasive and alkaline, so it doesn’t dissolve limescale. The acid does the work; baking soda only helps scrub loosened residue.
Is it limescale or soap scum?
Usually both. Hard water reacts with soap to form scum, as the USGS explains, and it sticks to the mineral film. The vinegar method lifts both.
