I spilled mixed fuel on a small area of my customer's aspalt driveway, and I need suggestions on how to cover, cleanup, or ??? The homeowner is a very good customer, and they are upset about seeing the discolored asphalt. To explain... I did a stupid thing a week ago when I spilled mixed fuel after refueling my Stihl FS85 string trimmer. I put the power head on the frame of the trailer, filled the tank, and then got distracted while putting the can away. I failed to put the cap on the tank. After the distraction passed, I picked up the trimmer, and started walking away. The fuel spilled from the tank, leaving an area about 5 feet long, 4-12 inches wide. The trailer was parked at the curb, so the spill starts at the curb and then runs onto the "outbound" end of their circular driveway. I feared the customer would be upset and when I returned today, my expectations were confirmed. The woman caught me early and wanted to know if I was responsible. I admited the problem and she said she tried to "take it up" by sprinkling something on it (kitty litter?). She wanted to know what caused the discolored pavement, and what could be done to get rid of the spot. I had no answer to her question. This issue will not go away, until it is resolved. The house is in an up-scale neighborhood ($600-$700K?), and very well managed. They just invested large money into new landscaping. The asphalt is about five or six years old, and never been sealed. Most houses in this neighborhood are concrete but a couple of them have alsphalt driveways and circular drives. Any suggestions? My worst fear is I will have to pay large $$$ to have sealer put down to cover the spot, plus the other several thousand square feet of driveway. Of course the spot is only a couple of square feet, but it is obvious. Any help?