Natural cleaning products are safer

Does it work?

Does not work

A regulator addresses the belief by name. This is not a claim about one technique but a reasoning error, and the two materials it most reliably damages are marble and wool.

This is a verdict on whether the technique is effective. Whether it is safe on a particular surface is a separate question, answered below.

Where not to use it

Why it works

There is no mechanism behind the claim at all. The claim proposes a relationship between a substance's ORIGIN and its EFFECTS, and no such relationship exists: a molecule behaves according to what it is, not according to how it was obtained. Acetic acid extracted from fermentation and acetic acid synthesised industrially are the same compound and do the same thing to calcium carbonate. Where the claim does track something real, it tracks it indirectly — products marketed as natural are often more dilute and more limited in what they contain, so they frequently are milder, but the mildness comes from the dilution and the short ingredient list rather than from the origin, and it disappears the moment a natural product happens to be concentrated.

Background

Almost every genuinely damaging piece of cleaning advice arrives wrapped in this framing. Vinegar etches marble because it is an acid, and being derived from fermentation does not soften the reaction. Lemon juice does the same. Wood ash is alkaline enough that it was the historical source of lye. Meanwhile one of the mildest cleaning products available — a near-neutral surfactant cleaner — is a manufactured formulation. The claim's persistence comes from conflating three separate questions that happen to share a word: what a substance is made from, what it does to a surface, and what it does to a person or the environment. They are independent, and the answer to the first predicts neither of the others. The Health and Safety Executive addresses the belief head-on in its COSHH guidance, listing 'it's natural so it can't be harmful' as a myth and answering that natural materials can be harmful, with henna, wood dust, stone dust and citrus oils as its examples.

What it does not do

• This is not an argument that manufactured products are safer, which would be the same error inverted — it is an argument that origin is not the question to ask
• Environmental impact is a separate question again, and a real one, and origin does not answer it either
• 'Chemical-free' is not a meaningful description of any substance, including water

What to use instead

• Neutral cleaner — A near-neutral surfactant cleaner. The recommended answer for natural stone of every kind, and the least interesting product in the cupboard for good reasons.
• Detergent — A surfactant-based cleaner. The general-purpose answer for greasy and particulate soil, and the correct first choice far more often than any specialist product.