Domestic, no earlier than 8.30 am, on the glass; usually about 9.00 am.
For quite a few commercial accounts we start early because it's just easier, for example, we do a bunch of factory units where everyone parks close to the building; it's much easier cleaning those when there's no cars in the way.
We also do a garden centre and a large restaurant with a 'wall of glass' on one side. Both are much easier to clean when there's no customers to annoy you.
Safer too.