I havent been on here in a while, been busy working 2 jobs, I mainly do fleets, but I also do concrete cleaning on the side. I recently got a call from one of my good customers asking if i can clean a driveway they leaked oil on. I can usally take my degreaser and spray it on the spots, aggitate, then pressure wash off, but Its so hot out here the soap dries before I can get it washed off. Im looking for something better, muratic acid, HF acid, citric acid? What are you guys using.