The honest answer is that it depends on your property. A shaded rear courtyard and a south-facing storefront sidewalk on Washington Street are two completely different maintenance problems. Three factors decide the schedule.
1. Foot traffic
Traffic is the biggest driver in a walkable city. A residential stoop on a quiet block might look fine for a year. A café frontage where hundreds of people pass daily will look tired within weeks of being cleaned.
2. Sun and drying time
Surfaces that dry quickly resist organic growth. Surfaces that stay damp — enclosed courtyards, north-facing walls, shaded side paths — grow green and black film far faster and need more frequent attention.
3. Trees and seasonal debris
Tree-lined blocks are wonderful and they generate constant organic material: leaves, seed pods, sap and berry staining. Properties under heavy tree cover run on a shorter cycle than open blocks.
A practical starting schedule
- Busy storefront sidewalks and entries: monthly to quarterly
- Residential stoops and sidewalks: once or twice a year
- Shaded rear courtyards and paver areas: annually, sometimes more
- Building façades and siding: every one to two years
- Decks and fencing: annually, or before staining
- Gutters: after fall leaf drop, and again in spring
Treat that as a starting point rather than a rule. The best schedule is the one where the property never gets far enough gone that a routine cleaning turns into a restoration project.