I’d recommend either the garage option or have the cleaners do a rotational deep clean at the units during the down time at each unit. Basically have a list of every possible deep cleaning thing that doesn’t get done in a normal clean or maybe gets done less deep (dusting instead of polishing for example, or wipe down of blinds instead of cleaning each slat meticulously) and have them start at the top and just go down the list each time they are waiting on laundry. They can pick back up at whatever point they left off the next time. By the time they finish the list the first thing on the list will certainly need doing again.
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