The short answer
Ask how the proposed method and access are affected by the forecast. Some tasks may need rescheduling or a separate finishing visit; keep the revised plan and any price change in WhatsApp.
Ask about the specific task
“Can you clean in the rain?” is too broad for a useful answer. Window cleaning, roof work, paving washing and applying a finish involve different methods and site conditions. Tell the provider which task is booked and ask what conditions would change their plan. The cleaner should assess suitability and access for the actual job rather than give one rule for every exterior service.
Separate washing from finishing
Where joint work, sealing or a treatment is included, ask whether those stages need different conditions from the initial clean. Product instructions and the surface condition should guide the timing. Confirm whether a further visit is already included and how you will know the job is complete. A dry-looking surface or an improving forecast is not a substitute for the provider’s assessment.
Agree how you will be updated
Use the existing WhatsApp booking conversation to confirm an appointment change. Ask who will contact you, what access arrangements need to remain in place and whether vehicles or furniture still need moving. Do not assume a provisional date is a confirmed replacement appointment. Keep the new time and any affected scope together with the original quote.
Clarify a changed or cancelled job
If the work or price changes, request the revised cleaning amount, booking amount and customer total before agreeing. If the job is cancelled, the booking payment is refunded in full. Discuss the cancellation and refund in the same conversation. Do not treat a request to reschedule as acceptance of additional work or a different price without it being confirmed.