So we sprayed wd40 on the hinges outside, the traier then was brushed by follage, leaving black streaks on the trailer near door... what can i use to clean this? Acetone?
I would try something bland like dawn soap first. If not, then I would go up to a cleaner, and then to barkeepers friend, especially depending on age of trailer.
I have used gel-gloss RV cleaner & wax from camping world on my Bigfoot. Removes black streaks with little effort and leaves a great shine. Camping world item # 18002