Someone on our road is having their roof cleaned and one of the workmen has knocked on the door to see if we want ours done. These houses are about 20 years old and they have red tiled roofs which I think look better aged than brand new, but that's just personal opinion, I'm sure the cleaned roof will be the preference of the neighbour having it done.
I'm just surprised that there are companies offering it, I've never heard of it before. Are there other unexpected things that can be pressure washed?
(Also, the more I type the word 'roof' the stranger it looks.)