How to remove Tar / Asphalt from Mattress
First 60 seconds
The first sixty seconds decide how this turns out. Scrape away the excess tar / asphalt from the mattress, lifting solids off the surface without pressing them further in. A petroleum-based residue that softens with a lubricant before it will lift instead of smear, and foam and padding absorb liquid deep and dry slowly, so over-wetting risks mold.
What you'll need
- WD-40 or a similar lubricant
- A dull knife or old gift card
- Dish soap
Step by step
- Test first: dab your chosen agent on a hidden corner of the mattress and wait 2–3 minutes to confirm no discoloration.
- WD-40 or a similar lubricant: spray lightly, wait a minute, then wipe from the outside in.
- A dull knife or old gift card: scrape gently at a low angle, never digging in.
- Dish soap: mix a few drops with cold water into a light suds.
- Rinse and blot dry with a clean cloth, then press with dry towels and change them until no more transfers onto the towel.
Do not do this
- Hot water as a first step. It spreads oil-based stains before they can be lifted.
- Rubbing the spot. It pushes the stain deeper and spreads it outward.
- Any heat source (iron, hair dryer, tumble dryer). Heat on mattress can bond the stain permanently or warp the material.
Common questions
Can I use hot water to remove tar / asphalt from mattress?
Hot water is not usually necessary, but on mattress it is safer to stay with cool water regardless, since foam and padding absorb liquid deep and dry slowly, so over-wetting risks mold.
Is it safe to scrub the stain out?
Scrubbing usually makes things worse. Blot or lift instead of rubbing, working from the outer edge inward so the stain does not spread.
What if the tar / asphalt stain has already dried?
A dried stain takes longer and may need repeated treatments, but the same agents still work — just re-wet the area gently first to reactivate the stain before treating it.