The Stain Library

Cleaner

White vinegar

A weak acid that helps with tannin and mineral marks, is genuinely useful diluted on carpet and fabric, and permanently etches limestone and marble.

  • TypeAcid
  • pHAcidic, around pH 2.5 undiluted
  • Reviewed31 August 2026

Safety

Never mix vinegar with chlorine bleach or with any product containing it, including many mould sprays and thin bleach. The combination releases chlorine gas. If you have used one, rinse and dry the area before going anywhere near the other.

How to use it

Dilute it. One part vinegar to three parts cool water is enough for a tannin mark, and the UK carpet trade body method for coffee is a detergent and vinegar solution applied a little at a time. Blot it back out rather than leaving it in the fibre.

Which materials it is safe on

  • Sealed wood No, not recommended

    Repeated acid contact dulls a lacquered finish, and floor finish manufacturers do not include it in their maintenance instructions. There is no benefit on a sealed floor that a damp cloth does not already give you.

    Use Washing up liquid instead.

  • Fabric sofa Only with caution

    Only on a W or WS coded fabric, well diluted and tested out of sight. On an S or X coded sofa any water based solution will leave a ring.

  • Cotton Yes, with a pre-test

    Diluted vinegar does not harm cotton fibre, but it can move some reactive dyes, so try it on a seam first on anything dark or brightly coloured.

  • Wool carpet Yes, with a pre-test

    Wool prefers mild acid to alkali, and the UK carpet trade body method for coffee on carpet uses a detergent and vinegar solution. Keep it dilute, apply a little at a time and blot it back out.

Which stains it actually shifts

  • Coffee Yes, it works

    The acid helps break down tannin colour that plain water and detergent leave behind, which is why it appears in the trade body method for coffee on carpet.

Vinegar has a reputation as a universal cleaner that it does not deserve, and a reputation as harmless that it definitely does not deserve.

Where it genuinely helps

Tannin marks, which is coffee, tea and red wine, and mineral deposits such as limescale. On those it does real work.

Where it does damage

Anything made of calcium carbonate. Marble, limestone and travertine etch on contact and the dull patch does not polish out at home. It also has no business near a natural stone worktop.

The one that matters

Acid plus chlorine bleach makes chlorine gas. This is the single most common dangerous mixture in domestic cleaning, and it happens because people treat both as ordinary household products.

Sources

What we checked and when. Where a manufacturer instruction disagrees with anything here, follow the manufacturer.

  1. National Carpet Cleaners Association, spot and stain removal guide trade body

    UK trade body procedure for carpet spills: blot under pressure, work from the outer edge inwards, and use a detergent and vinegar solution for coffee and tea.

    Checked 31 August 2026

  2. The WoolSafe Organisation, the cleaning and maintenance of wool carpets trade body

    Establishes that wool carpet needs low alkalinity products and no added bleach, that high alkalinity causes colour bleeding, and that spills are blotted rather than rubbed.

    Checked 31 August 2026

  3. Cleanipedia, how to remove coffee stains manufacturer

    States cold water first on clothing and warns that tumble dryer heat sets the stain if it has not fully gone.

    Checked 31 August 2026