House washing
Every 1 to 2 years keeps siding from ever reaching the point where staining sets in.
Dark shaded areas should be done every year — they hold moisture and grow algae faster than the rest of the house.
Roofs
Roofs should be done once every 3 to 5 years.
Gutters
Gutters should be cleaned out once a year. In heavy tree areas, two times a year.
Bottom line
Put the house on a 1 to 2 year schedule, gutters yearly, and the roof every 3 to 5 years.
