Cleaning this moss off the garden shed might be a spring chore. I say might be, because I kinda like it. The yard here is so heavily shaded that I have more moss than grass at this time of year. The moss requires less maintenance. Maybe a nice moss lawn is in order…
I agree, don’t “clean” this up. It’s beautiful and might inspire more great photos like the one above. Just call it a “green roof” and people will be impressed by your ecological sensibility.