The Stain Library

Cleaner

Washing-up liquid

Ordinary hand dishwashing liquid can help lift oily residue. Suitability depends on the actual product and the material: it is not a universal stain remover or a substitute for laundry detergent.

  • TypeSurfactant
  • pHFormulations vary. Check the label and safety information for the actual product rather than assuming every washing-up liquid has the same pH.
  • Reviewed8 October 2026

Safety

Do not mix washing-up liquid with bleach, vinegar or other household cleaners. Keep it in its original labelled container, away from children and eyes. This entry covers ordinary hand dishwashing liquid without added bleach or specialist cleaning actives; it does not establish the composition or safety of every brand.

How to use it

Follow the product label and the material's care instructions. Use only the amount and method specified for that combination, pre-test where permitted, and remove detergent residue as directed. Do not pour hand dishwashing liquid into a washing machine as laundry detergent.

Which materials it is safe on

  • Mattress Only with caution

    It works, but it cannot be rinsed out of foam, so use a trace of it on a barely damp cloth and expect to blot with clean water afterwards.

  • Fabric sofa Yes, with a pre-test

    Fine on a W or WS coded fabric, but it is water based, so it will mark an S or X coded sofa. Check the code and test out of sight first.

  • Sealed wood Yes, with a pre-test

    A little in warm water on a damp cloth is the standard manufacturer method for a sealed floor. The risk is the amount of water, not the detergent.

  • Cotton Yes, safe

    A mild surfactant at household dilution does not damage cotton fibre, and cotton can be rinsed thoroughly afterwards.

Which stains it actually shifts

  • Coffee Sometimes

    It handles the milk and oil in a milky coffee well, and does comparatively little for the tannin colour on its own.

This reference covers ordinary liquid used for washing dishes by hand. Dishwasher tablets, automatic dishwasher detergents, disinfectant mixtures and specialist spray products require their own instructions.

The practical value is removing oily soil, with limits set by both the formulation and the object being cleaned. For example, PLEXIGLAS guidance allows a small amount of dishwashing detergent with a damp soft cloth for its acrylic sheet. That is material-specific guidance, not permission to use the same method on every plastic, coating or bath.

For laundry, Dawn's published guidance describes pretreatment on cotton and polycotton and excludes delicate fabrics such as silk. Its instructions are specific to its products. Other brands and materials need their own care guidance; use normal laundry detergent for the wash itself.

The sources below support these boundaries. This page does not claim that The Stain Library has tested a brand or a stain-and-material combination.

Sources

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

  1. National Capital Poison Center: What to know about dish soap authority

    Supports surfactant/grease context, variable formulations, eye and ingestion precautions, original containers and avoiding mixtures with other cleaners.

    Checked 8 October 2026

  2. Dawn: How to use dish soap for laundry stains manufacturer

    Product-specific cotton/polycotton pretreatment, spot testing, exclusion of delicate silk, and warning against direct use as washing-machine detergent.

    Checked 8 October 2026

  3. PLEXIGLAS: Cleaning, maintaining and disinfecting correctly manufacturer

    Supports a small amount of dishwashing detergent and a damp soft cloth for PLEXIGLAS acrylic sheet specifically, rather than all plastics and finishes.

    Checked 8 October 2026