Homemade cleaners have a mixed reputation, and honestly they have earned it. A lot of what circulates online either does nothing, damages the surface it is used on, or is genuinely unsafe to mix.
But a handful of DIY recipes are excellent — cheap, effective, and made from three or four ingredients you can buy anywhere. This covers the ones that work, the ones that do not, and the combinations to never make.
Start here: what not to mix
Read this part before any recipe.
- Bleach + ammonia — produces chloramine gas. Remember that many glass cleaners contain ammonia and some “natural” products contain surprising things. This is the most dangerous combination in a home.
- Bleach + vinegar (or any acid, including lemon juice) — releases chlorine gas.
- Bleach + rubbing alcohol — produces chloroform and other irritants.
- Vinegar + hydrogen peroxide in one bottle — forms peracetic acid, which is corrosive. Used as separate sequential steps they are fine; combined and stored they are not.
- Vinegar + baking soda, expecting cleaning power — not dangerous, just pointless. An acid and a base neutralise into salt water. The fizz is carbon dioxide leaving, not cleaning happening.
The safe rule: never combine two cleaning products unless you know exactly what is in both.
The four ingredients worth keeping
- Distilled white vinegar — acidic. Dissolves limescale, hard-water spots, soap scum, and mineral deposits. Not a degreaser, not a reliable disinfectant.
- Baking soda — mildly alkaline and gently abrasive. Scours without scratching and absorbs odour.
- Unscented liquid castile or dish soap — the actual cleaner in most of these recipes. Surfactants are what lift grease and soil.
- Citric acid powder — stronger and less smelly than vinegar for descaling. Excellent in kettles, dishwashers, and toilets.
Distilled water is worth using in anything you store, because tap minerals cause streaking and shorten shelf life.
Recipes that work
Everyday surface spray
- 2 cups distilled water
- 1 teaspoon unscented liquid castile or dish soap
That is genuinely it. Surfactant plus water handles most kitchen and bathroom surfaces, and it is safe on sealed stone because it is pH-neutral. Shake gently before use and mix fresh every couple of weeks.
Do not add vinegar to this one — castile soap is alkaline, and acid curdles it into a white film.
Descaling and hard-water spray
- 1 cup distilled white vinegar
- 1 cup distilled water
For shower doors, taps, kettles, and anywhere limescale builds. Let it dwell several minutes on stubborn deposits.
Never use this on granite, marble, travertine, or unsealed grout — acid etches stone permanently.
Soft scrub for sinks and tubs
- 1/2 cup baking soda
- Enough liquid castile soap to make a paste
- Optional: 1 teaspoon hydrogen peroxide for stain lifting
Apply, leave a few minutes, scrub with a damp cloth, rinse well. It handles the same jobs as a commercial cream cleanser. Mix per use rather than storing.
Streak-free glass and mirrors
- 1 cup distilled water
- 1 cup distilled white vinegar
- Optional: 1 tablespoon cornstarch, which genuinely reduces streaking
Buff dry with a clean microfibre cloth. Distilled water matters more here than anywhere else. Avoid on coated screens and anti-glare surfaces — those want plain distilled water only.
Oven and stovetop paste
- 1/2 cup baking soda
- Water, added slowly to a spreadable paste
Spread over cooled surfaces, leave overnight, wipe away and rinse thoroughly. Slow but effective, and it replaces the harshest product most people own. Keep it off bare aluminium, which alkalis discolour.
Dishwasher and washing machine descale
Two tablespoons of citric acid powder in an empty machine on the hottest cycle. Monthly in hard-water areas.
Check your appliance manual first — a few manufacturers advise against routine acidic cycles because of seal wear.
Recipes to skip
- Vinegar and Dawn “miracle” spray. The acid partially neutralises the soap. It is not dangerous, just weaker than either alone.
- Castile soap and vinegar together. Same problem, plus a curdled white residue you then have to clean up.
- Essential oil disinfectants. Tea tree and thyme have some antimicrobial activity in lab conditions, but not at home dilutions with realistic contact times. Do not rely on them where disinfection actually matters. Several are also toxic to cats.
- Vinegar on everything. Wrong for stone, hardwood finishes, cast iron, and rubber seals.
- DIY disinfectants generally. If you genuinely need to kill pathogens, use a registered product with a tested dwell time.
Practical safety
- Label every bottle with contents and date. An unlabelled spray bottle is a hazard to everyone else in the house.
- Never reuse a commercial cleaner bottle without rinsing thoroughly — residue can react with what you add.
- Store away from children and pets. Homemade does not mean harmless; concentrated citric acid and castile soap both irritate eyes.
- Ventilate while cleaning regardless of what you are using.
- Mix small batches. Home recipes have no preservatives, and diluted soap solutions grow bacteria within weeks.
Frequently asked questions
Is vinegar a disinfectant?
Not a reliable one. It has modest activity against some organisms but does not meet the standard registered disinfectants are tested to. It is excellent at descaling and unremarkable at killing pathogens.
Why did my castile soap spray turn cloudy and filmy?
Either you added acid, or your tap water is hard. Castile soap reacts with both, forming soap scum. Use distilled water and keep vinegar in a separate bottle.
How long do homemade cleaners keep?
Vinegar-and-water solutions last for months. Anything containing soap should be mixed in small batches and replaced every few weeks. Discard anything cloudy or off-smelling.
Is DIY actually cheaper?
Substantially, for surface sprays and scrubs, since you stop paying to ship water. It is less compelling for specialised jobs, where a well-formulated commercial product often outperforms anything you can mix.
Keep going
This is one section of the Non-Toxic Cleaning Guide, which also covers choosing an all-purpose cleaner and when disinfecting is genuinely warranted.