So I cleaned a grocery storefront last night and I encountered a stain that I would like some input on. The stains are from wheeling the shopping carts from a recently seal coated parking lot into the building. I hit them with my sh mix (I made sure to be very careful using this next to the asphalt and I reclaimed the water) and it did lighten some of them up but not to my standard. I'm curious to know if any of you have dealt with this before and what worked best for you? Also, I am using hot water. I didn't take pictures but I will later today.