Shared desks need a rule, not a task
In an assigned office, a desk is cleaned around whatever is on it. In an agile office, the desk is supposed to be empty at the end of the day and often is not. The scope needs to say what happens then: whether the cleaner wipes around items, moves them to a nominated place, or leaves the desk entirely. Any of those is workable; none of them works if it is undecided.
Whichever rule you choose, it needs to be visible to staff as well as to the cleaner. A clear-desk expectation that is only written in the cleaning scope will not be followed. Where the organisation genuinely enforces clear desks, the cleaning is straightforward and the surfaces can be properly wiped every night. Where it does not, the scope should be honest about that and price accordingly.
