SOS ... Looking for the best way to remove OIL & GUM stains from concreate ... I have used 3 types of degreasers & acid ... What would be the next step ... The owner said there is something you pour on and rinse off and it take up oil & gum making look brand new... If you have info on chemical or the process please let me know terryfish1968@yahoo.com Terry Fish Integrity Powerwash