Trailer camper has some algae on it. Would you 2 step & brush?
If it’s just some algae wash it like a house and rinse really well.
Does it have stickers on it be very careful with house wash a non caustic truck wash is what I would start with
What makes you think it’ll mess with the stickers?
Years ago we decided to clean our trailers at the firehouse I sprayed house wash on them it turned the red stickers pink
House wash mixed worked great. I forget what color the stickers were although I was fortunate not to have any problems