Our proposals & contracts dictate that the homeower removes all items immediately on & around the work area. No one has ever had an issue with this. This also eliminates liability issues.
We will assist with moving if: They are elderly and clearly need help. We called them on short notice because we had an opening and they won't have time. If they're accomodating our schedule, we don't gripe about moving a few things.
We do annual deck maintenance for all our deck clients. Even though we tell them we'll be there within the following weeks, we often arrive with several items on the decks. We move them without complaint, and will sometimes just move heavier items (large grills, furniture) from one side to another for cleaning process, then call them and ask them to clear it off before we come back to apply a maintenance coat.