The kit · surfactant
Dish soap: what it removes and where never to use it
Liquid hand dishwashing detergent: anionic surfactants built to lift grease.
- pH
- 7–9
- Safe on
- 0 materials
- Never on
- 0 materials
- UK name
- washing-up liquid
01 How to use it
A few drops worked in with a fingertip or soft brush, or about ½ tsp in 1 cup (240 ml) of water for blotting. Use a clear, dye-free one on light fabrics.
- Coloured dish soaps can leave their own dye on pale fabric.
- Too much leaves sticky residue in carpet that attracts dirt; rinse it out.
How it works
Surfactants have a water-loving end and an oil-loving end. They surround oily particles so water can carry them away, which is how soap and detergent clean.
On a label
On an ingredient list, dish soap shows up as anionic surfactants such as sodium laureth sulfate, plus non-ionic surfactants.
Avoid routine home use on suede. The table gives general restrictions; an unlisted restriction is not proof that a product is compatible.
02 What it works on
- Oil and fat
- Tannin
- Oil-soluble pigment
- Pigment particles
- Protein
- Wax
- Sugar
Dish soap is strongest against oil and fat, and useful on tannin, oil-soluble pigment and pigment particles. It is part of the method in 771 stain files, for stains such as red wine, coffee, tea, cola, beer and matcha.
03 Where it is safe
| Material | Verdict | Why |
|---|---|---|
| Suede and nubuck | Avoid | Liquid soap leaves water marks on suede; use a suede eraser or cornstarch first. |
| Clothes | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| White shirt | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Jeans | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Linen | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Sheets and bedding | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Towels | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Baby clothes | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Polyester | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Leggings and activewear | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Wool and cashmere | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Silk | Test first | Use one drop in cool water and dab; silk can ring if one spot gets wetter than the rest. |
| Rayon and viscose | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Carpet | Test first | Keep it to a light, foamy solution and rinse well; soap left in padding attracts dirt. |
| Wool rug | Test first | Keep it to a light, foamy solution and rinse well; soap left in padding attracts dirt. |
| Fabric couch | Test first | Keep it to a light, foamy solution and rinse well; soap left in padding attracts dirt. |
| Microfiber couch | Test first | Keep it to a light, foamy solution and rinse well; soap left in padding attracts dirt. |
| Velvet upholstery | Test first | Keep it to a light, foamy solution and rinse well; soap left in padding attracts dirt. |
| Car seats | Test first | Keep it to a light, foamy solution and rinse well; soap left in padding attracts dirt. |
| Mattress | Test first | Keep it to a light, foamy solution and rinse well; soap left in padding attracts dirt. |
| Leather | Test first | A drop on a damp cloth is usually fine on finished leather; wipe it off with a clean damp cloth and condition after. |
| White sneakers | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Marble | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Granite | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Quartz countertop | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Wood furniture and floors | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Tile grout | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Painted walls | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
| Plastic containers | Test first | No material-specific permission is established by this general entry. Check the exact item and product labels and pretest; if compatibility is unknown, consult the manufacturer or a professional. |
04 How the files use it
Dish soap appears in 771 stain files. The steps it is used in most:
- Work in dish soap (239 files): Dish soap surrounds the oily part of the stain so water can carry it away; warm water helps fat dissolve.
- Blot with soapy foam (190 files): Using the foam rather than the water keeps the carpet from getting soaked; the soap still lifts the oil.
- Soap-and-vinegar sponge (96 files): Soap loosens the stain; the mild acid keeps tannins from setting and helps lift colour. Bar soap, which is alkaline, would do the opposite.
- Soap-and-vinegar blot (73 files): This is the classic tannin spotter: the soap loosens the stain and the mild acid stops tannins from setting and helps lift their colour.
- Wash with dish soap (50 files): Protein residue on a sealed surface lifts with ordinary detergent once it is wet.
05 Mixing
The combinations people ask about most, and what actually happens.
- Can you mix chlorine bleach and dish soap? Caution a product-dependent combination
- Can you mix white vinegar and dish soap? Caution a product-dependent combination
- Can you mix baking soda and dish soap? Caution a product-dependent combination
- Can you mix hydrogen peroxide and dish soap? Caution a product-dependent combination
- Can you mix oxygen bleach and dish soap? Caution a product-dependent combination
- Can you mix rubbing alcohol and dish soap? Caution a product-dependent combination
- Can you mix ammonia and dish soap? Caution a product-dependent combination
06 Files that use it
- Red wine on clothes
- Coffee on clothes
- Tea on clothes
- Cola and soda on clothes
- Beer on clothes
- Matcha on clothes
- Grape and cranberry juice on clothes
- Tomato sauce and ketchup on clothes
- Turmeric and curry on clothes
- Mustard on clothes
- Grease and cooking oil on clothes
- Butter on clothes
- Chocolate on clothes
- Berries on clothes
- Beetroot on clothes
- Gravy on clothes
- Salad dressing on clothes
- Egg on clothes
- Ice cream on clothes
- Soy sauce on clothes
- BBQ sauce on clothes
- Avocado on clothes
- Peanut butter on clothes
- Foundation and concealer on clothes
- Lipstick on clothes
- Mascara and eyeliner on clothes
- Nail polish on clothes
- Self-tanner and fake tan on clothes
- Hair dye on clothes
- Sunscreen on clothes
- Bronzer, blush and eyeshadow on clothes
- Perfume on clothes
- Hair and body oil on clothes
- Blood on marble
- Breast milk on clothes
- Drool and yellow pillow stains on clothes
- Baby food purée on clothes
- Crayon on clothes
- Slime on clothes
- Play dough on clothes
07 Myth files
- Is dish soap really the best thing for grease stains? Yes. Dish soap is a concentrated surfactant built to lift fat, and it is gentle enough for most washable fabrics.
- Does shaving cream remove carpet stains? Its foam is a surfactant, so it can lift fresh spots, but it must be rinsed out or it attracts dirt.
08 Questions
What stains does dish soap remove?
It works best on oil and fat, tannin, oil-soluble pigment and pigment particles, which is why it appears in the files for red wine, coffee, tea, cola and beer.
How do you use dish soap safely?
A few drops worked in with a fingertip or soft brush, or about ½ tsp in 1 cup (240 ml) of water for blotting. Use a clear, dye-free one on light fabrics. Coloured dish soaps can leave their own dye on pale fabric.
What should you never mix with dish soap?
This reference cannot establish that any commercial cleaner has no dangerous mixing partner. Do not combine cleaners unless their exact manufacturers explicitly permit the use; rinsing alone does not establish compatibility for later treatment.
Where should you never use dish soap?
Nowhere on file is ruled out completely, but check the material file before using it on anything delicate.