Eight inputs — foot traffic, sidewalk proximity, adjacent businesses, climate, tier, time of day, building age, current contract — and the math says daily, twice-weekly, weekly, biweekly, or monthly. Plus the per-pane time estimate, the comparison to the current contract, and the case-for-change written in language the client will actually read.
The combination of medium foot traffic, coffee shop / light retail adjacency, and mid-tier business tier puts the soiling pressure squarely in the weekly band — which is what the contract specifies. No case to make; the cadence is right. If the storefront stops looking clean between visits, the cause is in the cleaning quality or chemistry, not the frequency.