How to Remove Grease Stains Already Washed and Dried

You missed the grease stain before washing the garment, and now it has been through the dryer. The heat from the dryer has polymerized the grease (cooking oil, butter, or body oil) into the fabric fibers, making it dramatically harder to remove than a fresh stain. But it is not impossible.

The Dish Soap Pre-Treatment (Try First)

Apply a generous amount of degreasing dish soap (Dawn is the most effective commercial option because its formula contains powerful surfactants originally designed for petroleum spills) directly onto the dried grease stain. Work it into the fabric with your finger or an old toothbrush, scrubbing gently. Let it sit for 30 minutes.

The surfactants in dish soap surround and emulsify grease molecules, breaking them into tiny droplets that can be suspended in water and washed away. Even on set-in stains, the soap can penetrate and begin dissolving the polymerized grease layer.

Rinse with the hottest water safe for the fabric, then launder normally. Check the stain before drying. If the stain is lighter but still visible, repeat the dish soap treatment. Multiple applications often succeed where a single application leaves a shadow.

The Baking Soda Absorption Method

For thick or dark grease stains, cover the stain with a thick layer of baking soda and let it sit for 24 hours. The baking soda absorbs any liquid grease component that has not fully polymerized, drawing it out of the fabric through capillary action. Brush off the baking soda, apply dish soap as described above, and launder.

Cornstarch works similarly to baking soda for grease absorption and can be substituted if you do not have baking soda on hand.

The WD-40 Counter-Intuitive Method

Spray a small amount of WD-40 onto the grease stain. Yes, you are applying a petroleum product to a grease stain. WD-40’s solvent base dissolves the polymerized grease, breaking it back into a liquid state that can then be removed by dish soap.

Apply WD-40, let it penetrate for 5 minutes, then immediately cover with dish soap and work it in. Launder in the hottest safe water with extra detergent. WD-40 is itself a grease, so the dish soap step is essential to remove both the original stain and the WD-40.

The Cardboard Technique for Precision

Place a piece of cardboard or a folded paper towel inside the garment, directly behind the stain. This prevents the dissolved grease from bleeding through to the other side of the fabric when you apply dish soap or solvents, which would create a new stain on the back layer of a shirt or pant leg.

When the Stain Will Not Come Out

After 3 to 4 treatment cycles, if a shadow remains, the grease has permanently bonded to the fabric fibers through thermal polymerization. At this point, the garment can still be worn if the stain is in an inconspicuous location, or repurposed as a work or garden shirt. Dark-colored garments hide grease shadows much better than light ones.

Professional dry cleaning uses industrial-strength solvents (perchloroethylene or hydrocarbon) that dissolve polymerized grease more effectively than household products. A dry cleaner is worth trying ($3 to $8 per garment) before giving up on a valuable piece of clothing.

Prevention Going Forward

Treat grease stains immediately. Fresh grease is liquid and responds to dish soap and hot water within minutes. The moment a grease stain goes through a hot dryer cycle, the difficulty of removal increases tenfold. Keep a small bottle of dish soap in the laundry area and apply it directly to any grease spots you notice while sorting clothes into the washer.

Bottom Line

Dish soap directly on the stain, worked in with a toothbrush, left for 30 minutes, then laundered in hot water. For severe set-in stains, spray with WD-40 first to re-liquify the polymerized grease before the dish soap treatment. Repeat as needed. Treat grease stains before drying to prevent the problem entirely.