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Old 09-06-2023, 10:41 AM   #27 (permalink)
j-c-c
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I think one aspect seldom mentioned here is oil hard stains I suspect are largely made up of the solids/particles carried in the oil, not the oil itself, just removing residue oil does not always remove the solid contaminates left behind after the oil is removed. The oil that has seeped into the microstructure of concrete often carries with it those particles. I am uncertain how susceptible they are to enzyme destruction.
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