Actually there is a magic formula, but it isn't sold in gallons. It's sold in a 20 oz. spray bottle and it is called exactly what it is, Totally Awesome. It is sold at dollar tree stores for a buck and this stuff is well... Totally Awesome. For bugs just spray a slight mist all over windshield, it doesn't take alot, then just use the squeege at the fuel stop. doesn't matter if it's just water or washer fluid and the bugs come off like they were not even there. This stuff is also Totally Awesome for tar and other stuff that sprays from the road on your van or truck. Just spray on and wipe off with a paper towel. This stuff will clean anything. I've seen it at family dollar stores too, but dollar tree always has it in stock. A friend of mine even uses it on his laundry. Oh yeah I also use it to clean my tires. Just spray on and wipe off with a rag or spray on tires before washing. tires look nice and black but not shiny.