This scrubbing motion creates friction, which helps to dislodge the oil from the microscopic pores. As the mixture dries, it hardens into a crust that pulls the oil to the surface, where it can be swept away and the process repeated if necessary.
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To apply this method, a thick paste of baking soda and water is often spread over the stain and left to dry completely. For older, set-in stains, the surface needs to be cleared of any loose debris or standing water.
Instead of sitting on the surface, it penetrates the microscopic pores and capillaries of the concrete, bonding with the aggregate and cementitious matrix. Unlike water-based spills, oil is hydrophobic, meaning it repels moisture and does not dissolve easily.
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Mechanical Action and Degreasing Agents Once the surface is prepped, the removal process relies on breaking the bond between the oil and the cement. Materials like baking soda, cornstarch, or specialized concrete poultices act as desiccants.
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