Granite is acid-proof, so vinegar is fine on it

Does it work?

Disputed

Disputed, and unusually the dispute is inside a single source rather than between two. The stone association records both the resistance and the recommendation against, and both are correct about different things. Recorded as disputed rather than refuted because the claim's chemistry is genuinely right — it is the scope that fails.

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

The claim's chemistry is correct as far as it goes. Silicate minerals do not react with dilute organic acids the way calcium carbonate does, so the etching mechanism that ruins marble is genuinely absent. What the reasoning omits is that the acid does not only meet the mineral. It meets whatever impregnating treatment is on the surface, which is an organic coating with its own tolerances; it meets whatever accessory minerals the particular rock contains, which for commercially-named granite may include carbonates; and it sits on a polished surface whose appearance depends on a finish rather than on bulk composition. A conclusion about the rock therefore does not transfer to the worktop, and the trade guidance reflects that by recommending against acids while recording the rock's resistance.

Background

This is the most defensible of the acid-on-stone claims, and it is still not a licence. Granite is a silicate and does not undergo the carbonate reaction that etches marble; the stone trade's own guidance records siliceous stone as generally resistant to most acids found in kitchen settings. The same guidance, in the same place, declines to recommend acidic cleaners on it. The gap between those two statements is where a reader gets into trouble, and it has three parts. Nearly every installed granite worktop carries an impregnating treatment, which the trade describes as a repellent rather than a sealer and which acids degrade regardless of the stone beneath. Stone sold commercially as granite is not a mineralogical designation and includes rocks containing carbonate minerals that behave more like marble. And the polished finish is a surface condition rather than a bulk property. The claim is about a mineral; the question is about an object.

What it does not do

• Where the specific stone and its treatment are genuinely known, the acid question may well be answerable — CleaningHQ simply cannot answer it generically
• Nothing is lost by using a neutral cleaner instead, because that is the trade recommendation for both stone classes
• This record makes no finding about engineered or quartz-composite worktops, which are a different material with their own manufacturer guidance

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 catalogue 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.