Answer
SIMPLE GREEN CLEANER OR OTHER WITH ENZYMES TO ATTACK THE OIL,,,OLD OIL STAIN MAY NEED DILUTE ACID CLEANING (USE CAUTION WITH EYE PROTECTION RUBBER GLOVES AND ANY SKIN CONTACT,,,.ACID MUST BE NEUTRALIZED WITH NON-DETERGENT AMMONIA TO GET RID OF THE ACID IN CONCRETE,,,,THEN FLUSHED WITH A LOT OF FRESH WATER...
First answer by ID3451680069. Last edit by ID3451680069. Question popularity: 22 [recommend question]
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