I talked with a manager today that told me she gets this building cleaned every 1.5-2yrs. It has some pretty heavy mold so I am not sure if it was just not cleaned properly or if the service was a little more like 4 years. I have another meeting with her on monday. With a soft wash on the dryvit and SH application everywhere else and pressure where needed; a thorough cleaning, how long would you expect a building facade like this to stay clean? I was thinking it would be clean at least 2 years and 3 or 4 before it gets dark again. This side of the building is in the shade most of the day. What would your estimate be?