How to Clean Shower Glass: Removing Hard Water Stains That Will Not Come Off
Cloudy shower glass is one of the most common things people give up on. You scrub, it looks better for a day, and the haze comes back. Most of the time it is not dirt at all, it is limescale bonded to the glass, and it needs a completely different approach. This guide covers the professional method we use in Brisbane homes, starting with the one test that tells you whether the glass can be saved at all.
Why Shower Glass Goes Cloudy
Every time you shower, water sprays across the glass and then dries there. The water evaporates and the minerals it was carrying stay behind. Do that twice a day for a year and you have a layer of limescale, mostly calcium carbonate, bonded to the surface.
Mixed in with it is soap scum: the residue left when soap and body wash react with the minerals in hard water. That is why the haze feels slightly greasy in some spots and rough in others. They are two different deposits and they need different treatment.
In Brisbane this happens faster than most people expect. Inner-city suburbs supplied from Wivenhoe Dam sit around 115 mg/L of calcium carbonate, which is the hardest water in the city. That is enough to leave visible deposits within weeks on a screen that is never dried.
None of this is a hygiene problem. It is chemistry, and it is reversible in most cases. But only if you work out what you are dealing with first.
Step 1: Find Out If the Glass Can Be Saved
This is the step almost everyone skips, and it is the reason people waste an hour scrubbing glass that was never going to improve. Before you apply anything, you need to know whether the haze is a deposit sitting on the glass or damage inside it.
The blade test
Take a flat glass scraper, the type with a replaceable razor blade that hardware stores sell for removing paint from windows. Use a blade that is not worn. Hold it almost flat against the glass, so the blade lies along the surface rather than digging into it, and draw it across a hazy area.
Then look at what comes off.
| What you see | What it means | What to do |
|---|---|---|
| A fine white powder or flakes lift off | Limescale sitting on the surface | The glass can be cleared. Go to Step 2 |
| Nothing comes off and the haze stays | The glass itself is etched. The damage is inside the material | No cleaning product will fix it. See below |
| Powder in some areas, nothing in others | Both. Scale on top of partly etched glass | Treat it, and expect the etched areas to stay hazy |
Why a blade will not scratch the glass: shower screens in Australia are required to be safety glass, which in practice means toughened glass. Held flat and drawn across the surface, a clean blade rides on the deposit rather than the glass. What scratches glass is grit dragged under pressure, not the blade itself. If your screen is decades old and predates current standards, test on a low corner first.
If there is no scale at all
Sometimes the scraper lifts nothing because there is nothing to lift, and the glass is not etched either. What looks like haze is soap film: a thin, slightly greasy layer of soap and body wash residue with no mineral buildup behind it. It feels slippery rather than rough.
In that case skip Step 2 entirely. Warm soapy water and a firm sponge will clear it in a few minutes, followed by a rinse and a squeegee. There is no reason to put an acidic product on glass that does not need one, and doing so only puts the aluminium frame at risk for no benefit. Identifying the soil is as much about using less product as it is about using the right one.
What etched glass actually is
If nothing lifts off, the glass has been chemically attacked. Hard water and cleaning products slowly dissolve the silica at the surface, leaving microscopic pits. The technical term is glass corrosion, sometimes called etching. Light scatters in those pits, which is why the glass looks permanently foggy even when it is perfectly clean.
It is more common on cheaper toughened glass, and it builds up over years of scale being left to sit. Once it has happened, no product reverses it. Polishing compounds can reduce the appearance slightly, but the honest answer is that the panel needs replacing if the look matters to you.
Knowing this in thirty seconds is worth more than any product recommendation. It is the difference between a job that works and an afternoon wasted.
Step 2: Apply the Product and Let It Work
Limescale is alkaline, so it dissolves in acid. Scrubbing harder does almost nothing, because the deposit is bonded to the glass rather than sitting loose on it. What removes it is the right product given enough contact time.
For heavy buildup we use Peerless Jal One Shot, a concentrated acidic cleaner available at Bunnings. It is the same product we recommend for heavy toilet limescale, and it works on glass for the same reason.
Safety, and this matters more here than in a toilet bowl. You are applying a concentrated acid on a vertical surface at face height, so splashback is a real risk. Wear rubber gloves and safety glasses, and ventilate the bathroom with the window open or the exhaust fan running. Never mix it with bleach or with any mould remover, because acid and bleach together release toxic chlorine gas. If you have used a mould product on the screen recently, rinse the whole area thoroughly before starting.
What you will need
- Peerless Jal One Shot, a concentrated acidic cleaner
- A flat glass scraper with a fresh blade
- A firm scourer sponge, not a metal one
- A squeegee with a soft rubber blade (see the note below)
- Gloves and eye protection (several options work, see below)
- Dishwashing liquid
- Old cloths or rags to protect the frame
On squeegees: the blade matters more than the price. A stainless steel professional squeegee lasts longer, but the rubber on it is firm and does not always seal against the glass. A cheaper disposable squeegee has softer rubber and clears the panel better, which is what you want if you are only doing this occasionally.
On protection: there are plenty of valid options and the specific brand does not matter. We use disposable nitrile gloves and safety glasses. What is not optional is wearing something: you are working with a concentrated acid on a vertical surface at face height.
Instructions
- Protect the frame. Aluminium frames do not tolerate acid. Lay old cloths along the bottom track and any frame edges before you apply anything. If product does land on aluminium, rinse it off immediately with water rather than leaving it to sit.
- Ventilate and gear up. Open the window or turn on the fan, put on gloves and glasses.
- Apply the product across the whole screen. Cover the hazy areas generously. Within about a minute you can see the scale start to dissolve, which is a useful confirmation that you identified it correctly.
- Leave it for 10 minutes. On a vertical surface the product runs down, so there is no benefit in leaving it longer than that. Ten minutes is enough for the acid to break the bond.
Step 3: Clean, Rinse and Dry
The acid loosens the scale but does not remove it. This stage lifts what is left, and how you do it decides whether the glass ends up clear or covered in new marks.
- Make up soapy water. Warm water with a squeeze of dishwashing liquid, in a bucket or a bowl.
- Wash the screen with a firm sponge and the soapy water, in small circles. Work over the whole panel, applying light pressure. The soap film is doing something important: it lubricates the surface so the sponge lifts the softened scale instead of dragging it across the glass. Never scrub dry. Dry scrubbing with grit on the surface is what puts scratches in glass, not the sponge.
- Rinse thoroughly with clean water. Every trace of acid has to come off, especially anywhere near the frame.
- Squeegee the panel, top to bottom. Then wipe the edges with a dry cloth.
- Let it dry completely and look again. Dry glass shows what actually happened. Wet glass always looks clear.
- Deal with anything left. If patches remain, either repeat the whole cycle on those areas, or take the flat scraper to them now that the surface is dry. Both work. The scraper is faster on small isolated spots.
Why the final dry matters: a surface is not finished when the deposit is gone, it is finished when it is dry and free of water and product residue. Water left to evaporate on the glass deposits the same minerals you just removed. Squeegeeing is not tidying up, it is the last step of the clean.
What People Try That Does Not Work
Most of the advice for cloudy shower glass fails for the same reason: it treats the haze as dirt when it is a mineral deposit.
Glass cleaner
Standard glass cleaner is formulated for fingerprints and dust. It has no acid in it, so it cannot dissolve calcium. It will make a lightly filmed screen look better and will do nothing at all to real limescale.
Vinegar, on heavy buildup
White vinegar is a mild acid and it does work on light scale, given time. On a screen with years of buildup it is too weak, and on vertical glass it runs off before it can act. If you want to try it, soak paper towels in vinegar and press them against the glass so it stays in contact. Even then, expect it to handle light haze only.
Scrubbing harder
The most common mistake. Pressure does not break a chemical bond, and dry scrubbing with any abrasive is how glass gets scratched. If the product has not softened the deposit, more force is not the answer.
Bicarb paste on its own
Bicarbonate of soda is alkaline, and so is limescale. Chemically it is the wrong tool. It gives a mild abrasive action, which is why it seems to help slightly, but it is not dissolving anything.
How to Keep Shower Glass Clear
Everything above is a recovery job. Once the screen is clear, keeping it that way takes about thirty seconds a day, and it is far easier than doing this again in a year.
Squeegee after every shower
This is the whole thing. If the water does not dry on the glass, the minerals never get deposited. Keep a squeegee inside the shower and run it down the panel before you get out. Nothing else on this list comes close to it in effect.
Ventilate
Leave the exhaust fan running for twenty minutes after the shower, or open the window. Less humidity means faster drying and less mineral deposit, and it also helps with shower mould.
A weekly wipe
Once a week, wash the screen with the same soapy water and sponge, rinse and squeegee. Five minutes. It removes soap film before it has a chance to combine with minerals into something that needs acid to shift.
How often to do a full treatment
With daily squeegeeing, most Brisbane homes will not need the acid treatment again for a year or more. Without it, in the harder-water inner suburbs, buildup becomes visible again in a few months.
Identify First, Then Treat
The reason cloudy shower glass has a reputation for being impossible is that people skip straight to scrubbing. Thirty seconds with a flat scraper tells you whether you are dealing with a deposit you can remove or damage you cannot, and everything after that follows from the answer.
That order, work out what the soil actually is, apply the product that dissolves it, then clean and dry to a finished surface, is the same on every hard cleaning problem in a home. It is what the Easy Bliss 3D Cleaning System is built on.
Rather Not Handle Acid Yourself?
Shower screen treatment is part of a full bathroom reset in our deep cleaning service. We bring the products, the equipment and the experience to know when glass can be saved and when it cannot.
Check Pricing and Book OnlineFrequently Asked Questions
How do you get hard water stains off shower glass?
First check whether the haze is a deposit or etched glass, by drawing a flat glass scraper across the surface. If white powder lifts off, it is limescale and it will come off. Apply a concentrated acidic cleaner such as Peerless Jal One Shot, leave it 10 minutes, then wash the panel with a firm sponge and soapy water in small circles. Rinse thoroughly, squeegee, and let it dry before checking the result.
Why is my shower glass still cloudy after cleaning?
Usually one of two reasons. Either the product was not acidic enough or was not left in contact long enough to break down the limescale, or the glass is etched. Etching is chemical damage inside the glass itself, caused by years of minerals and cleaning products attacking the surface. If a scraper lifts no powder at all, the haze is etching and no cleaning product will remove it.
Can you fix etched shower glass?
Not really. Etching means the surface of the glass has been dissolved into microscopic pits, and those pits scatter light. Polishing compounds can reduce the appearance slightly on light etching, but the damage is not reversible. If the look matters, the panel needs replacing. Preventing it is a matter of not letting scale sit on the glass for years.
Will a razor blade scratch shower glass?
Not if you use it correctly. Australian shower screens are safety glass, in practice toughened glass. Held almost flat against the surface with a clean blade, the edge rides on the deposit rather than the glass. What scratches glass is grit dragged under pressure, or scrubbing dry with an abrasive. Use a blade that is not worn, and test on a low corner if the screen is very old.
Does vinegar clean shower glass?
It works on light, recent buildup if you can keep it in contact with the glass, for example by pressing vinegar-soaked paper towels against the panel. On heavy limescale it is too weak, and on a vertical surface it runs off before it can act. For years of buildup you need a concentrated acidic cleaner.
Will acidic cleaner damage the aluminium frame?
Yes, acid attacks aluminium, so the frame needs protecting. Lay old cloths along the bottom track and frame edges before applying anything, and if product does land on the aluminium, rinse it off with water straight away rather than letting it sit.
How do hotels keep glass shower doors so clean?
Two reasons, and neither is a special product. Hotel screens are wiped down after every single use as part of housekeeping, so minerals never get the chance to dry on the glass and build up. And the panels are replaced on a maintenance cycle long before etching sets in. At home you can replicate the first one with a squeegee and thirty seconds a day, which is genuinely most of the difference.
How often should I clean my shower glass?
Squeegee it after every shower, which takes about thirty seconds and does more than anything else on this list. Wash it with soapy water once a week. With that routine most Brisbane homes will not need a full acid treatment again for a year or more.
What causes the white film on shower glass?
Two things at once. Limescale, which is calcium carbonate left behind when hard water dries on the glass, and soap scum, which forms when soap reacts with the minerals in that water. Brisbane's inner suburbs have moderately hard water, around 115 mg/L in areas supplied from Wivenhoe Dam, so both build up faster than people expect.