An "old" stain is essentially a deep-seated residue that has polymerized, making it significantly harder to lift than a fresh spill. After the dwell time, scrub the area vigorously and rinse thoroughly with clean water.
Alkaline Cleaner: Breaking Down Oil Bonds for Effective Stain Removal
Fresh oil is a liquid that penetrates the porous surface, seeping into the tiny capillaries. If the stain is still slightly oily or damp, layer a thick covering of baking soda, cornstarch, or commercial absorbent pads over the affected area.
Instead, rely on an absorbent medium. Hold the wand at a slight angle and move systematically across the stained area to ensure you blast away all remnants of the cleaning agents.
Alkaline Cleaner: Breaking the Bond of Polymerized Oil Stains
Concrete driveways, patios, and garage floors are durable surfaces, yet they have a way of holding onto stubborn stains, especially old oil spills. Effective removal requires a solution that can penetrate, emulsify, and suspend this dried residue so it can be rinsed away completely.
More About How to remove old oil stains from concrete
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