How To Remove Sugar Soap Streaking on Windows
How do I remove streaking on windows after using Selleys Sugar Soap?
If you washed the house down before painting and the Sugar Soap solution reached the glass, the marks you are looking at are a hard, salt-like deposit. That is why detergent, elbow grease and methylated spirits have all failed — none of them dissolves a mineral salts residue.
Selleys' recommended fix is Hillmark Cerapol Ceramic Glass Cleaner, which is specially formulated for cleaning and polishing glass. Apply it and rub vigorously with a clean, soft cloth or paper towel, then wipe over with a soft cloth or paper towel.
The alternative Selleys names is Selleys Complete Clean Glass & Mirror Spray, which removes dirt, spots and fingerprints from the surface and leaves a streak-free shine.
What actually happened on the glass
Selleys Sugar Soap is a salts-based cleaner — sodium tripolyphosphate and sodium carbonate. On a porous surface like a painted wall, residue is absorbed and is invisible under the next coat of paint. Glass is the opposite: it is hard and non-absorbent, so when the solution dries on it the water leaves and the cleaning salts stay on the surface as a hard deposit.
That is why the product's own data sheet carries the instruction to rinse it well from glass before the product dries. It is not a suggestion about finish quality; it is the step that prevents this exact problem.
The dilution was the other half of the problem
A 3:1 mix is very strong. At that ratio the solution is extremely high in solids — cleaning salts — so far more material is left behind when it dries.
Selleys' recommendation for most cleaning tasks is 40:1, which is 5 litres of water to half a cup of Selleys Sugar Soap. That matches the product's own directions: half a cup into half a bucket, 5 litres, of water, diluted to suit the cleaning task.
| Mix used | Recommended mix |
|---|---|
| 3 : 1 | 40 : 1 — ½ cup into 5 litres |
Stronger is not better with an alkaline salts cleaner. Above the recommended dilution you get more residue rather than more cleaning, and on a house wash the residue lands on everything nearby.
How to clear the marks
- Apply Hillmark Cerapol Ceramic Glass Cleaner to the affected glass.
- Rub vigorously with a clean, soft cloth or paper towel. The deposit is hard, so this stage takes physical work — that is why the instruction says vigorously.
- Wipe over with a soft cloth or paper towel to finish.
- Check in raking light before you move on. A salts film is far more visible with the sun across the glass than straight through it, and a second pass now is easier than starting again later.
Once the glass is clear, Selleys Complete Clean Glass & Mirror Spray is the product for keeping it that way — it removes dirt, spots and fingerprints and leaves a streak-free shine. Rotate the nozzle to ON, spray directly onto the surface, then wipe.
Limitations — check before you spray
Selleys Complete Clean Glass & Mirror Cleaner is suitable for glass, mirrors, stainless steel, ceramic and porcelain. It is not suitable for tinted windows, acrylic surfaces, fibreglass, or painted, lacquered or varnished surfaces.
That first exclusion matters on a house wash. Window film is not always obvious from outside, and it is common on west-facing glass. Its directions also say to test suitability in a small inconspicuous area first and not to mix it with detergents or other chemicals.
For reference, its published figures are a blue colour, a mild solvent odour, a density of approximately 1.0 g/mL and a pH of around 11, in a 750 mL plastic spray bottle. Figures are indicative data only and are not intended for the preparation of specifications.
Avoiding it on the rest of the house
- Use the recommended dilution — half a cup into 5 litres.
- Work in sections you can rinse before the solution dries, especially in sun or wind.
- Rinse glass promptly. Sugar Soap's stated limitation is to rinse well from glass before the product dries.
- Wipe it off immediately from aluminium and brass surfaces. Window frames and flyscreen surrounds are usually aluminium, and they sit directly beneath the glass you are washing.
- Never mix another product into it. Selleys does not recommend adding anything to Selleys Original Sugar Soap.
Safety: the dilution that caused the streaking also removed your margin
Selleys Original Sugar Soap is classified as hazardous under Safe Work Australia GHS 7 with the signal word Danger, on one classification: serious eye damage, Category 1 — H318, causes serious eye damage. There is no skin, inhalation or flammability classification. Complete Clean Glass & Mirror Spray is classified Warning — H319, causes serious eye irritation. No hazard data is reproduced here for the Hillmark glass cleaner, which is not a Selleys product; read its own pack.
Why the 3:1 mix matters twice
The dilution is the centre of this page, and it has a second consequence beyond the deposit on the glass. H318 is assigned to the product as supplied. At the recommended 40:1 — half a cup into five litres — the working solution is a long way from that. At 3:1 it is close to it. The same error that left salts on the windows also removed most of the safety margin from every splash for the whole house wash.
Category 1 is permanent damage, not stinging that passes. Sugar soap reads as a mild, old-fashioned product. It is alkaline at roughly pH 11, and alkali injuries to the eye are worse than acid ones because an alkali keeps penetrating the tissue rather than self-limiting.
A house wash is overhead work, which is the wrong posture for this. You are on a ladder or at arm's length above your head, with solution running down the wall, down your arms and off the eaves — towards a face that is looking up. And this is a job people do in shorts and sunglasses at best. Safety glasses before you fill the bucket, and mix at ground level rather than up the ladder.
A splash is a 15-minute flush, not a rinse. Irrigate with copious water for a full fifteen minutes with the eyelids held open, then ring the Poisons Information Centre. Blinking it out is what turns a treatable exposure into a permanent one.
The instruction never to mix another product into Sugar Soap is a chemistry instruction, not a performance one. Rinse a surface and let it clear before you move to a different cleaner on it.
For the repair itself the hazard is lower. Complete Clean Glass & Mirror Spray carries H319 — Category 2A irritation rather than Category 1 damage — and it is ready to use, so there is no decanting step. Glasses still, because you are spraying at eye level onto glass that reflects.
Poisons Information Centre — 131 126 in Australia, 0800 764 766 in New Zealand.
Common questions
What are the marks on my windows?
A hard salts-like deposit. Sugar Soap is a salts-based cleaner — sodium tripolyphosphate and sodium carbonate — and the deposit is what is left when the solution dries on glass.
Why did methylated spirits not work?
It is not the right chemistry for a mineral salts residue. Selleys' recommendation is a product formulated for cleaning and polishing glass.
What removes it?
Hillmark Cerapol Ceramic Glass Cleaner, applied and rubbed vigorously with a clean soft cloth or paper towel, then wiped over.
Was my dilution too strong?
A 3:1 mix is quite strong and very high in cleaning salts. The recommendation for most cleaning tasks is 40:1 — 5 litres of water to half a cup of Sugar Soap.
Can I use Complete Clean Glass & Mirror Spray to remove the deposit?
Selleys lists it as an alternative, and it is the product for dirt, spots and fingerprints and for keeping glass clear afterwards. Cerapol is what Selleys nominates for removing the deposit itself.
Is Glass & Mirror Spray safe on all my windows?
No. It is not suitable for tinted windows, acrylic surfaces, fibreglass, or painted, lacquered or varnished surfaces. Test a small inconspicuous area first.
How do I stop this happening again?
Rinse Sugar Soap well from glass before it dries, and use the recommended dilution rather than a strong mix.
What about the aluminium window frames?
Wipe Sugar Soap off aluminium and brass immediately. It can tarnish or discolour bare metal — see what Sugar Soap does to brass and aluminium.
Should I have used Sugar Soap on the windows at all?
No. See can I use Sugar Soap to clean my windows — Selleys does not recommend it for glass, and removing white Sugar Soap marks from glass covers the same repair.
Why did Selleys Sugar Soap leave streaks on windows after cleaning in preparation for painting?
Selleys Sugar Soap is a salts-based cleaner containing sodium tripolyphosphate and sodium carbonate. When the solution dries on hard glass surfaces, it leaves behind a hard deposit of these cleaning salts, creating visible streaks and marks. This is especially pronounced when a strong dilution ratio is used, resulting in very high solids content on the glass.
What is the best product to remove sugar soap streak marks from windows?
The best way to remove sugar soap streak marks is to use Hillmark Cerapol Ceramic Glass Cleaner, which is specially formulated for cleaning and polishing glass.
How do I use Hillmark Cerapol Ceramic Glass Cleaner to remove streaks?
Apply the cleaner to the streaked glass surface, rub vigorously with a clean, soft cloth or paper towel, then wipe over again with a soft cloth or paper towel to remove all residue.
Is there an alternative product to Hillmark Cerapol for removing streaks from glass?
Yes, another effective option is Selleys Complete Clean Glass & Mirror Spray, which removes dirt, spots, and fingerprints from glass surfaces while leaving a brilliant streak-free shine.
What is the recommended dilution ratio for Selleys Sugar Soap to avoid streaking issues?
The recommended dilution for most cleaning tasks is 40:1, meaning 5 litres of water to half a cup of Selleys Sugar Soap, rather than using an overly concentrated solution like the 1:3 dilution mentioned by the user.
How can streaking from sugar soap be prevented in the first place?
To prevent streaking, use the proper dilution ratio (avoid overly concentrated solutions) and rinse thoroughly from the glass before the product dries, so salt residue doesn't build up.
Does Selleys recommend using Sugar Soap to clean windows?
No, Selleys does not recommend using Selleys Original Sugar Soap to clean windows, as residue can become very difficult to remove from glass surfaces. A standard glass cleaner is the more appropriate choice for windows.
Did methylated spirits and detergent work to remove the sugar soap streaks?
The user reported trying detergent with elbow grease and methylated spirits, but none of these methods worked to remove the streaking caused by the sugar soap.