Oil stains on interlocking stone show up as darkened patches that will not lift with scrubbing. Stone is quite porous, and when oil spills on its surface, it penetrates beneath the surface of the stone. Using a poultice is the best way to draw out oil stains from stone, according to the Marble Institute of America. You must apply the poultice, remove it and reapply it up to five times to successfully draw out the stain, especially if the oil finds its way into the cracks between interlocking pieces.
- Skill level:
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Things you need
- White spirit
- Nylon-bristle scrub brush
- Distilled water
- Baking soda
- Cling film
- Low-adhesive tape
Pour white spirit onto the stained area to saturate it.
Scrub the area vigorously with a scrub brush to remove any surface oil or debris. Pay special attention to the joints between interlocking stones.
Rinse the area clean with distilled water.
Blot the area dry with a towel.
Create a peanut butter-thick paste of baking soda and distilled water. About 0.454kg. of paste will cover 1 square foot of stain.
Apply the paste over the stained area in a 1/4 to 1/2 inch thick layer. Extend the paste roughly 1/4 inch past the stain. If the oil stain penetrated to one of the joints of the interlocking stone, be sure to press the paste deep into the joint with your fingers.
Cover the paste in cling film. Seal the edges of the cling film to the stone with low-adhesive tape.
Leave the poultice in place for 24 to 48 hours.
Remove the cling film and allow the poultice to dry out. If it has already dried out, move on to step 10, but the next time you apply the poultice, make sure the tape creates an airtight seal.
Scoop up the dried paste and discard it.
Flush the treated area with distilled water. Blot dry with a towel then wait for the stone to air dry.
Examine the treated area. If the stain remains, reapply the poultice, but this time, mix white spirit and baking soda instead of water and baking soda to make your thick paste. Remove and reapply the poultice up to five times or until you make no more progress in removing the stain.
Tips and warnings
- Depending on the depth of the stain and the length of time it has had to set, you may only be able to lighten the oil stain.
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