You have to use ZANFEL like a degreaser for your garage driveway. When you apply it, it will draw up the oils. If you have it really bad, it will relieve you for a couple of hours, until more of the oils break the surface and the reaction begins. At this point, you are supposed to reapply. Like a degreaser, it will continue to draw up the oils, until there is none. If I have the ability to do the process, I am over it within a day, 2 at the most. If not, when I can do the process, it relieves me and eliminates the PO a lot quicker than if I hadn't used it at all.