Stain file № 1227 · Food · Hard surfaces
How to get grease out of grout
Draw out the oil; scrub with dish soap. Never vinegar. Stubborn on grout if you act quickly.
- Editorial difficulty
- Stubborn
- Estimated hands-on
- 9 min + 20 min waiting
- It sets
- once it is washed and dried
- Kit
- 2 items + 2 tools
01 The short answer
To get grease out of grout, work in this order: (1) draw out the oil; (2) scrub with dish soap. The key measure: cornstarch on it, 15–30 min, brush off. Rinse and dry.
This may be difficult to remove. Repeated treatment can damage the item; a persistent mark is a reason to consult a professional.
02 Never do this
- Vinegar. Acid slowly dissolves cement grout, so lines sink and crumble over time.
03 Before you start
- Use white cloths or paper towels only: coloured ones can transfer their own dye into grout.
- Identify the grout and any adjacent stone; use only compatible products. Acid and abrasives can damage grout or tile.
- Pretest every permitted treatment on an inconspicuous area, including trims, and let it dry. Stop for colour transfer, lightening, rings, stiffness or distortion. A successful spot test does not guarantee the whole item is safe.
04 The method
Draw out the oil
Cover the stain completely with cornstarch (or baking soda or talc) and leave it 15–30 minutes. Brush or vacuum it off, and repeat while the powder still comes up darker.
Why it works: Fine powder pulls fresh oil out of the grout by capillary action, like a wick. It is the gentlest way to remove the bulk of the oil.
2 min hands-on · 20 min waiting
Scrub with dish soap
Scrub the grout line with warm water, a few drops of dish soap and an old toothbrush, then rinse and wipe dry.
Why it works: Grout is porous; brushing gets soap into the texture where the stain sits.
5 min hands-on
Rinse and seal
Rinse and dry. Once fully dry, a grout sealer keeps the next spill on the surface.
Why it works: Sealed grout gives you time to wipe up before a stain soaks in.
2 min hands-on
05 Dried, set, or back again?
- Old oil has partly oxidised and gone sticky; apply the degreasing step two or three times, and give powder an overnight stay where it is used.
Assess the mark only once the item has dried according to its care instructions. If it remains, do not keep repeating or strengthening treatment; obtain advice for the exact material and product.
06 What grease is made of
- Oil and fat
The oily part of grease will not dissolve in water at all. It needs a surfactant such as dish soap, or a solvent, to break it up, and a dry powder can draw fresh oil out before you start.
- Grease stains look like dark wet patches that never dry because oil fills the gaps between fibres and lets more light through. They add no colour, only translucency.
- Dish soap molecules have one water-loving end and one oil-loving end. They surround each oil droplet so water can carry it away.
- An oil stain can be invisible on wet fabric and reappear once dry; check before the dryer, because heat locks it in.
07 The material: tile grout
No soaking, so each treatment is applied, given a few minutes, and blotted away.
It tolerates hot water (up to about 60 °C (140 °F)) for the final wash, but only after any protein has been rinsed out cold.
- Cement grout is porous and alkaline; acids such as vinegar slowly dissolve it, which is why acid cleaning makes grout lines sink and crumble over the years.
- Oxygen bleach paste whitens grout without the fumes of chlorine, and works on most coloured grouts too.
The tile grout file rates every common cleaner for it.
08 Next time
Wear an apron when frying, keep a box of cornstarch near the stove, and treat oil marks before the first wash: dryers lock grease in.
09 Questions
Can I use hot water on grease on grout?
Warm water helps here once the first steps are done; stay within the care label (up to 60 °C (140 °F)) and check the stain has gone before any dryer.
Does vinegar help with grease on grout?
Keep vinegar away from grout. Acid slowly dissolves cement grout and its sealer; use oxygen bleach paste instead.
Can I use bleach on grease?
Only on white, bleach-safe cotton and only as a last step, diluted per the label.
Will grease come out of grout completely?
This may be difficult to remove. Repeated treatment can damage the item; a persistent mark is a reason to consult a professional.
When should I call a professional?
Cracked or crumbling grout, which needs regrouting, not cleaning.