Trailer cleaning ?

My first job at the RV dealership I worked at was as a detailer. We always used Spray 9. It worked better than anything else for the money. Spray it on and then wash it after a few seconds.Take a towel and wipe the stuborn spots afterward but don't let the Spray 9 sit too lond dry, especially on decals. It will spot. Another thing to try once you have washed the trailer is Pledge. It removes those black streaks and waxes at the same time. It works surprisingly well.