I wfp'ed the outside of a detatched house a few months ago.
The paint had green algae patches and the cost of a repaint was around a grand.
I didn't know what to charge really and the bloke offered me £200. I used a product called sandtex which i diluted in a 25 litre barrel and used the trolley to put it on.
Hour and a half to cover most of the house the 1st day before i ran out of sandtex.
1/2 hour the next day to finish off.
Left for 24 hours the rinsed down house in an hour.
Came up like a new paint job.
Customer was very impressed. Took 4 hours overall with traveling times.