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Yes, the video shown is fairly accurate. I used it daily and observed the progress. It will continue to work at oil that had been 'absorbed' into concrete. One cup should treat a "fully" oil stained concrete floor. (Most people will be treating a, say, 20sqft area...) Trust me, I had the cleanest concrete pad in town, hands down...
For cost, buy bigger packages...a 2.5 gallon bucket is about $150....much cheaper than wages, saves a lot of time....there are packages of various sizes. Remember, you sprinkle it on, sweep it in, and wait about a week . You can sweep more in if you wanted to.....
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