Short answer
A glass cleaner removes dirt, soap and mineral spots but leaves the glass unchanged, so the marks return. A nano coating does not clean anything: it bonds a thin water-repellent layer to the glass so water beads and runs off before it can dry into spots. A coating only works on glass that has been properly cleaned and descaled first, so most glass needs both, in that order.
Walk down any cleaning aisle and "glass cleaner" and "glass coating" sit side by side, as if they did the same job. They do opposite jobs. Buying the wrong one is why so many people clean their shower screen every weekend and never get ahead of it.
What a glass cleaner does
A cleaner removes. Detergents lift soap and grime; acid-based descalers dissolve mineral deposits. Used properly, the result is clean glass.
But the glass itself is unchanged. Water still spreads across it in a thin film, that film still dries, and the minerals in it still stay behind. A cleaner resets the clock; it does not stop it.
What a nano coating does
A coating changes how the glass behaves. It does not clean anything. Most glass coatings are based on silica or silane chemistry that bonds to the glass and leaves an ultra-thin, water-repellent layer on top. On coated glass, water pulls itself into beads and runs off instead of spreading and sitting there, and it takes most of its minerals with it.
Because the coating bonds to the glass itself, it can only bond to glass that is genuinely clean. Put it over soap film or scale and it bonds to the dirt, or seals the marks in.
Side by side
| Glass cleaner | Nano coating | |
|---|---|---|
| Its job | Removes what is on the glass | Changes how water behaves on the glass |
| How often | Every time you clean | Once, then looked after |
| Works on dirty glass? | Yes, that is the point | No, it needs clean, descaled glass |
| What you see after | Clean glass that still holds water | Water beading and running off |
| Stops marks coming back? | No | Slows them right down; you still squeegee |
Why coatings fail
- Applied over residue. The most common failure by far. The glass looked clean, but a thin layer of scale or soap was still there.
- Not left to cure. Coatings need time and a dry surface to bond. Showering on it too soon weakens it.
- Cleaned too hard afterwards. Abrasive pads, scouring powders and harsh cleaners wear most coatings away faster.
- Expected to last forever. Every coating wears. Hard water and heavy use wear it sooner.
So which do you need?
| Your glass | What it needs |
|---|---|
| New, still clear | A coating now, before marks start |
| Light spots | A proper clean and descale, then a coating |
| Thick, cloudy build-up | A degrease, a strong descale and a scrub, then a coating |
| Etched (cloudy even when clean) | A coating can help water run off, but it will not hide damage already in the glass |
In other words, almost everyone needs both, in the right order. Removing without sealing brings the marks back; sealing without removing locks them in.
How the Infinite Coatz kit combines them
That order is the whole design of the kit: clean, strip, scrub, then seal. The first three bottles remove what is on the glass, and the final step seals it with a 9H nano coating that lasts up to two years, depending on how hard your water is and how often the shower runs. There is a spare Glass Cleaner in the box to maintain the surface in between.
For the cleaning side in more detail, see how to remove hard water stains from shower glass.