I posted on the other BBS but should have here first because this is where most of the pros are so I apologize. Anyway I cleaned a relatives Dairy Queen and they wanted me to get all the gum up from the drive through; to make a long story short I told my uncle that Elvis himself probably chewed on that gum because it loked like it actually had been there that long! It took me 6 hrs to clean the parking lot, playground area, dumpster pads. I came home wet, trigger hand cramped, particles of dirt and food all over me. I loved it though because I didnt have to clock in or out, Take a lunch at a certain time, and I got to spend some of the afternoon with my little ones. I love this job! Had problems with the oil stains on the parking places and drive through though! I used Delco's DSR-50 becvause on the 5gallon container it said for concrete too but It did'nt do much but go from yellow to green color and the stais were still there. Is there any way to get them out totally? Doesnt the oil soak in the concrete? I really need help on this one because thats what took me so long on this job. Oh I was using heat too! Thanks!