Start by observing
A façade on a busy road, a picture window by the garden and a shopfront don’t get dirty in the same way. Pollen, deposits and marks can help you decide whether cleaning is worthwhile.
Match the rhythm to the need
For a home, start with a one-off clean and see how the result holds up over time. A shop may prefer a regular schedule. Adjust the frequency to the exposure and the standard of presentation you expect.
Group the surfaces together
Mention the frames, tracks, glass doors and any glass roofs. A clear scope makes the quote easier to compare. Stubborn marks should be flagged separately.
For an assessment of your needs, request a quote.