Short answer
Most Treasure Valley homes look their best with a soft wash every one to two years. Homes near fields, gravel roads, construction, or the river — or with light-colored siding — often benefit from a yearly wash.
Signs it's time
Siding looks dull or 'faded' (often it's just dirty)
Cobwebs and egg sacs along eaves, soffits, and window corners
Dust lines and irrigation splash along the bottom of walls
Green or dark streaks on the shady side of the house
You're planning to sell, repaint, or host something big
Good times of year
Spring and early fall are ideal — warm enough to rinse well, and timed to clear either winter grime or summer dust and webs. Many customers pair a house wash with window cleaning, since a freshly washed house makes dirty glass stand out.
Rather have a pro handle it?
Pro Solutions does house washing across Boise and the Treasure Valley. Quotes are free, itemized, and usually texted the same day.