Bought some "Driveway Cleaner" (barnd name) to use on a 1920's house driveway /garage floor. Oil & dirt was built up so thick I scraped up chuncks to get down to the concrete, sprayed the "Driveway Cleaner" and let it set over night and preasure washed the next day...did a supper job of clenaing then applied an epoxy garage floor paint...looks like new..
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