The problem is timing, not thoroughness
A shared kitchen is at its best at nine in the morning and its worst at three in the afternoon, every single day. Overnight cleaning addresses the first state and has no effect on the second. Adding more overnight time makes the morning marginally better and the afternoon exactly the same, which is why complaints continue after a provider has increased the service. Operators frequently make that change and are surprised when the complaints continue unchanged.
The effective intervention is a short attendance in the middle of the day: bench surfaces cleared and wiped, sink emptied, bins emptied, dishwasher cycled or unloaded if that is agreed, floor spot-checked and consumables restocked. Fifteen or twenty minutes at the right hour changes the experience of the space more than an hour added at midnight ever will. Timing it just after the main lunch period usually produces the largest improvement.
