For many Raleigh-area homeowners, a once- or twice-per-year schedule is a strong starting point. The right timing depends on tree cover, roof pitch, nearby dust, and how visible buildup gets after pollen season.
Homes under mature oaks or pines usually need more attention than open-lot homes. So do homes near busy roads, active construction, or neighborhoods where humidity leaves a sticky film on the array.
A common pattern is one cleaning after peak spring pollen and another later in the year if the system is exposed to heavy summer grime or fall debris. Commercial properties or highly visible residential arrays may benefit from a routine maintenance plan.
The goal is simple: keep the panels clear enough that you are not losing output to something easy to fix. A quick inspection after pollen season is often the best way to decide whether the system is ready for cleaning.