Old grease is a different beast to fresh oil
A fresh oil splash is annoying but manageable. An old, set-in grease stain — the kind you find on work pants weeks later, or a jacket that's already been through a wash or two without anyone noticing the mark was still there — is a whole different level of stubborn, because the grease has had time to bond properly with the fabric fibres and, if it's been through a hot wash or dryer already, it may have partially set.
Step-by-step for a set-in grease stain
- Squeeze dish soap directly onto the stain — don't be shy with it, you want it saturated.
- Make a paste by adding a bit of baking soda into the dish soap right on the fabric. Baking soda's an absorbent, so combined with the soap's degreasing power you've basically got a mini degreasing kit.
- Work it in with a soft-bristled toothbrush — small circular motions, don't go too hard on delicate fabric.
- Leave it 15–30 minutes. For a really old, deep-set stain, longer doesn't hurt — up to an hour is fine.
- Rinse with cool water, then wash as normal, checking before drying.
If it's already been washed and dried once
This is the trickiest scenario, because heat may have partially set the stain already. A trick worth knowing: a light spray of a water-displacement lubricant (WD-40 is the common one) can actually reactivate an old, heat-set grease stain enough that dish soap can grab onto it again. Spray it lightly, let it sit 15–30 minutes, then go through the dish soap and baking soda steps above. It sounds counterintuitive — putting more oil on an oil stain — but it works because it re-liquefies the set grease so it can be lifted rather than scrubbed at while dry.
What not to do
- Don't use hot water on the initial treatment — it can further set whatever grease is left.
- Don't scrub aggressively hoping brute force will win — you'll just wear through the fabric before the stain gives up.
- Don't dry it between attempts, even if it looks like it's mostly gone. "Mostly gone" plus a hot dryer usually means permanently there.
- Don't give up after one attempt — old grease genuinely needs persistence, it's not a reflection of you doing it wrong.
Fabric-specific notes
This is a robust method for cotton, denim and workwear-grade synthetics. On anything delicate — wool suiting, silk — skip the WD-40 reactivation step entirely and skip vigorous brushing; dab gently with diluted dish soap and accept that a genuinely old, set-in grease stain on a delicate fabric may need a professional dry cleaner's solvents to fully shift. There's no shame in that — some jobs are outside what a home kitchen cupboard can realistically do.
When it's beyond a DIY fix
If you've gone two or three rounds and there's still a shadow, or it's on a fabric you don't want to risk experimenting on, that's the point to stop and hand it over. Our wash & fold service pre-treats stubborn loads before anything goes near heat — worth a shot before you write the garment off as a lost cause.
Common questions
Does WD-40 actually work on old grease stains, or is that a myth?
It's a genuine trick, not a myth — it works by re-liquefying grease that's already dried and partially set, so dish soap has something to actually grab onto again. Always follow it with a thorough dish soap treatment and a full wash, don't leave WD-40 residue in the fabric.
Can I use a commercial degreaser instead of dish soap?
You can, and for really stubborn stains a dedicated laundry pre-treatment spray with degreasing enzymes can work faster than dish soap alone. Dish soap is just the reliable, always-in-the-cupboard option that genuinely works, which is why it gets recommended so often.
Why does the stain look gone when wet but reappear once dry?
That's usually a sign there's still a small amount of grease left that's just not visible while the fabric's wet and darker overall. Always let it fully air dry and check in good light before deciding it's actually gone.
Got a stain that's beaten you? Bag it up and let us deal with it — our wash, dry & fold service handles the tricky loads too, and we'll flag anything that needs special care before it goes anywhere near a dryer.
Book a Laundry PickupSources: Maytag, Red Kap, The CoBuilders, Tom's Guide and general cleaning-science consensus on set-in grease/oil stain treatment. Fact-checked 29 July 2026. General guidance only — always check your garment's care label first.