Welcome to Forum participation, Chuck.
A band of skid resistant texture runs front to back on ours, and it cleans just about as easily, and right along with, the rest of the decking surface. It appears to have been part of Monaco's factory painting process, and is the same color as the rest of the roof.
If yours appears to be like the stuff bought off reels by the foot at hardware stores, it was likely added by a previous owner, and is more aggressive than factory texture.
Joel