14. Apr. 2026
Cleaning Windows Without Products: Methods Per Situation
Cleaning windows is one of the situations in the home where water-based cleaning seems most intuitive but in practice requires the most nuance. Glass is a smooth, non-porous surface that in principle is ideal for water-based cleaning. The problem is not the glass itself but the soiling on it and the method of removal. Streak-free clean windows without products is achievable if the working structure is correct and the type of soiling fits the method. This article covers windows per situation: interior glass, exterior glass, limescale streaks, and frames. Per situation, it describes which method is mechanically most suitable and what the pitfalls are. Interior glass has the least intensive soiling of all glass surfaces in the home. Dust, condensation residue, fingerprints, and light deposits of soap mist near the bathroom or kitchen: those are the most common soiling types on interior glass. Ozone water with the two-cloth method is for that combination the most suitable method. A dry finishing cloth after wiping with ozone water is the key to a streak-free result. Exterior glass has a heavier soil profile: weathering deposits, dust, bird droppings, and in urban environments also soot particles. For dry soil and light organic deposits on exterior glass, ozone water works with sufficient contact time. For heavier deposits or dried-in stains, a pre-treatment with warm water and a cloth is more effective for the cleaning. Limescale streaks on windows occur with the use of tap water from a region with hard water. Those limescale streaks require an acid reaction and cannot be removed with ozone water. A mild vinegar solution or a specific limescale cleaner is the right method. Window frames of plastic, wood, or aluminium each have their own approach that is further described in this article. The topic of window cleaning is also for most people a recurring household moment that takes time and with the right approach goes considerably faster and more effectively. The central approach in this article is the two-cloth method: a damp cloth to loosen the soil, a dry microfibre cloth to immediately pick up the moist residue. That working structure is the decisive factor for the final result, more important than the choice of cleaning product. Ozone water, water with a drop of soap, or even pure water: the result on interior glass is comparable with the right working structure. The advantage of ozone water is that it leaves no soap residue and the oxidative reaction effectively removes organic deposits even at light concentrations. The order for window cleaning is always: first remove dry deposits if present, then the moist cleaning, then immediately wipe dry before drying occurs. Whoever consistently applies that order always has a streak-free result regardless of the type of glass surface or soil type. The four parts of this article each give a concrete approach. Interior glass: ozone water, two-cloth method, streak-free result. Exterior glass: pre-treatment for heavier deposits, ozone water, two-cloth method. Limescale streaks: vinegar or descaler, not ozone water. Frames: a slightly different working method per material but always a dry wipe as the final step. Whoever knows those four approaches has a complete foundation for cleaning all windows in the home. Those four approaches are directly applicable to any home, regardless of the type of glass, frame, or hardness of tap water.
Cleaning windows without cleaning products. Which water-based methods work per situation: interior windows, exterior windows, limescale streaks, and dirty frames.
Window Cleaning Without Products: How It Works
Interior glass: the simplest situation
Interior glass is the most suitable glass surface for ozone water. The soiling is light: dust, condensation residue, fingerprints, and light soap mist. The surface is smooth and non-porous. The environment is controlled: no wind, no direct sun that dries the water before it can be picked up. Ozone water, 20 to 30 seconds contact time, dry microfibre cloth in vertical wiping direction: that consistently gives a streak-free result on interior glass.
The only pitfall with interior glass is applying too much water. A slightly damp cloth gives a better result than a splattering spray. The contact time is sufficient for light deposits, even with a limited amount of ozone water on the surface. More about the working structure is described on the page about the two-cloth method.
Exterior glass: more variable soil profile
Exterior glass is more varied in the type of soiling. In urban areas and on busy roads: soot particles and fine dust that adhere to the glass. In rural areas: dust, pollen, and biological deposits of algae on north-facing windows. In all environments: bird droppings that cannot be removed directly with a dry cloth without pre-treatment.
For light, fresh organic deposits and dust on exterior glass, ozone water works with sufficient contact time. For dried-in stains or bird droppings, a brief pre-soak with warm water is the first step. Then ozone water for the oxidative cleaning and the two-cloth method for the streak-free final result. More about how ozone water works is on the ozone water information page.
Limescale streaks: the limit of water-based cleaning on windows
Limescale streaks are the most common complaint when cleaning windows and at the same time the clearest limit of what ozone water can do. Limescale streaks on windows form when tap water with high mineral content dries on the glass surface. The calcium particles remain as a white or grey layer that is visible when light passes through it. Ozone water does not remove that limescale layer: the oxidative reaction has no effect on calcium carbonate.
A mild vinegar solution, diluted with water in a ratio of 1 to 3, briefly applied to the glass and picked up with a damp cloth, dissolves the limescale deposit through an acid reaction. Then dried with a dry microfibre cloth for a streak-free result. For stubborn, built-up limescale layers, a specific limescale cleaner is more effective than vinegar. It has a higher acid concentration in a safely usable formulation.
Frames: a different approach per material
Frames are with windows the biggest variable in the cleaning approach, because the material differs greatly per dwelling. Plastic frames are the most common in newer homes in the Netherlands. They are resistant to ozone water and mild cleaning products. Daily deposits of dust and light biological deposits respond well to ozone water with the two-cloth method.
Wooden frames are more sensitive to moisture. A damp cloth is acceptable for a brief cleaning session, but the frame must be wiped dry afterwards to prevent damage to the wood or lacquer layer. Ozone water is suitable for wooden frames when using a lightly damp cloth and a dry follow-up wipe. Aluminium frames are resistant to ozone water and are the least sensitive of the three material types to the cleaning fluid used.
The working structure for windows: step by step
The most effective working structure for window cleaning with ozone water can be described in four steps. Step 1: remove dry deposits if present. Step 2: apply ozone water with a lightly damp cloth or spray, let act for 20 to 30 seconds. Step 3: wipe horizontally or vertically with the damp cloth. Step 4: immediately follow up with a dry microfibre cloth in the opposite direction. No waiting, no drying in, no extra pass. Four steps, streak-free result.
The choice of horizontal or vertical wiping relates to position: interior side vertical, exterior side horizontal. That convention makes it easier to see which side the problem is on if a streak appears. More about the working structure is available on the two-cloth method page.
When ozone water is the best choice for windows
Ozone water is the best choice for windows in the following situations. Interior glass with daily deposits: always. Exterior glass without limescale deposits with light to moderate deposits: with sufficient contact time. Plastic and aluminium frames: daily and weekly maintenance. Glass doors indoors: daily maintenance. Skylights and glass roofs that are accessible: with the right working structure.
Ozone water is not the right choice for windows in the following situations. Glass with limescale streaks from hard tap water: vinegar or descaler is more effective. Heavily soiled exterior glass after a long period without cleaning: first a specific thorough cleaning. Glass with chemical contamination or paint splashes: a specific solvent is required.
Windows as a practice area for water-based cleaning
Windows are a particularly suitable practice area for anyone who wants to start with water-based cleaning. The result is immediately visible and objectively assessable: streak-free or not. That makes interior glass the ideal starting point for anyone who wants to test whether ozone water and the two-cloth method work for them in practice. A positive test result on interior glass immediately gives insight into how the working structure is improved for exterior glass or other surfaces.
Whoever starts with interior glass quickly notices that the result with a good working structure is equal to or better than with glass cleaner. That confidence in the method is transferable to other surfaces in the home. More about available systems is on the ozone water machine page.
Practical summary: cleaning windows without products
Interior glass: ozone water, 20-30 seconds contact time, dry vertically with dry microfibre cloth. Exterior glass lightly soiled: ozone water, two-cloth method. Exterior glass heavily soiled: pre-soak with warm water, then ozone water, two-cloth method. Limescale streaks: vinegar solution 1 to 3 diluted, briefly acting, wipe with damp cloth, wipe dry. Plastic frames: ozone water, two-cloth method. Wooden frames: lightly damp cloth, immediately wipe dry. Aluminium frames: ozone water, two-cloth method.
That summary covers the most common situations in window cleaning in Dutch households. Whoever applies the right method per situation consistently has a streak-free result without using conventional glass cleaners for most window situations.
The distinction per situation: the core of window cleaning
The difference between the four cleaning situations for windows is simultaneously the most instructive aspect of the approach. Whoever understands why interior glass is directly suitable for ozone water but limescale streaks are not has the fundamental insight about working mechanisms that is transferable to all other cleaning situations in the home. Glass is the most transparent test surface: the result is unambiguously visible and leaves no room for interpretation. Streak-free or not, limescale-free or not.
That transparency makes window cleaning the best way to evaluate and improve the working structure. Whoever starts with interior glass and refines the working structure based on the visible result builds the insight that is also applicable to other glass surfaces and surfaces in the home.
Windows as a standard for the working structure
Windows are not only a cleaning situation but also a standard for the quality of the working structure. Whoever applies the working structure correctly sees it directly on the glass surface. Whoever makes a mistake in the working structure also sees it directly. That direct feedback makes window cleaning an excellent moment to evaluate and refine the working structure for all glass and non-glass surfaces that are cleaned regularly.
That evaluation value is a bonus alongside the practical cleaning function. Whoever refines their working structure based on the feedback of the glass surface cleans not only windows better but every other surface that gets cleaned regularly.
That transferable learning value makes window cleaning more than just a cleaning task in the home.
Related articles in this cluster
This article is the second in-depth article in the cluster on cleaning in the home without products. The hub is at cleaning kitchen without cleaning products. Cleaning the bathroom is at cleaning bathroom without products. Floors are at cleaning floors without products. Furniture is at cleaning furniture without chemicals.
More information and contact
For information about available ozone water systems, the ozone water machine page is the most appropriate starting point. For specific questions, contact is available through the contact page.
💬 "Interior glass I now do with ozone water and it really works better than with glass cleaner. Exterior glass too, except when there is limescale from the garden hose on it. Then I do that with vinegar." — Koen, home user
Previous cluster
Background on natural and alternative cleaning is in the previous cluster at natural cleaning what people mean.
Further reading
An overview of all guides is on the guides page.