I frequently use "LA’s Totally Awesome". Dollar General and probably all such stores have it in a 16 oz spray bottle for $1. Also have a larger pour bottle for $3. No acid, ammonia or bleach, and non-flammable. We buy the large bottles and pour it into a pump sprayer for our engines. Spray, let sit for a few minutes, pressure wash. Does a great job. Not sure about decal compatibility – be careful. Cheers, JW in Dixie
