Pretreated at 50/50 with a pump up. I let it sit until I got my reclaim stuff laid out (10-15 minutes). xjetted a mix of about 16 oz to 3 gal. Surfaced cleaned and rinsed. This was a combination of oil and transmission fluid from a vehicle rollover that sat on the concrete for about 72 hours. Took all of about an hour and half I reckon.