Why a standing booking is the only workable arrangement
Booking a dock slot each week is a task somebody has to remember, and it will fail. Booking it once as a standing arrangement means the slot exists unless somebody actively cancels it, which is the safer direction. It also gives the cleaning attendance a recognised place in the building's schedule rather than making it a discretionary use of a contested resource. It also gives cleaning a recognised place in the building's schedule rather than a discretionary one.
The standing booking matters most for the things that cannot be improvised: bringing a machine into the building, removing bulk waste, delivering a pallet of consumables. Routine attendance without equipment movement can usually work around a lost slot. Anything involving something that will not fit in a passenger lift cannot, and those are the events worth protecting. Those events are the ones the standing booking exists to protect.
