If metal roof then similar to above, then at least higher end cost or above depending on roofing materials - (about $1200-2000) unless roofing panels are also damaged, not just ridge vent / cap.
1 Work the soap into a lather all over your hands, scrubbing the skin under and around your nails as well. 2  If you still smell gasoline on your hands after washing them with soap, mix a few drops of vanilla extract with water and rub it into your hands to reduce or eliminate the smell.
Submerge a nylon bristle scrub brush into the cleaning water. Scrub the gas stain with the scrub brush. Let the emulsifier remain on the gasoline stain for five to 10 minutes. Rinse the area thoroughly with plain water.