How often does an office kitchen need a deep clean?

An office kitchen gets wiped every evening and still, at some point, becomes a place people would rather not use. The two facts are not in tension. Nightly work is built around surfaces and bins, and the things that eventually make a kitchen unpleasant are almost never surfaces or bins.

What a nightly clean reaches

Counters, the sink basin, the visible fronts of appliances, the floor, the table, and the bins. That is a real job and it is the right job to do daily. It is also, by design, everything you can do to a kitchen in the time between one office leaving and the next arriving.

What it does not

The problems build in places nobody is looking at, and they build slowly enough that no single day is the day it got bad.

• The fridge door seal, where the rubber folds. Spills run into it and stay.
• The fridge drip tray and the drain hole at the back of the interior.
• The microwave roof, which nobody looks at, and the turntable ring under the plate.
• The kettle interior, and the underside of the tap and its aerator.
• The sink drain and the trap, which is usually the actual source of a smell people blame on the bins.
• The gap between the counter and the appliance next to it, which collects everything and is too narrow to wipe.
• The underside of cupboard doors and the handles' backs, where hands actually touch.
• Coffee machine drip trays and internals, which are somebody's job in principle and nobody's in practice.

None of these are in a normal nightly scope. That is not a failure of the cleaner; it is what the scope says.

What moves the interval

The calendar is the least useful input. Three things matter more.

• Headcount against kitchen size. Twelve people sharing one small kitchen is harder on it than forty with a proper staff room.
• Whether people actually cook. An office where lunch is reheated daily is a different problem from one where the kitchen makes coffee and holds a fridge.
• Whether the fridge has an owner. An unowned communal fridge is the single most reliable source of a kitchen going bad.

So how often

Most offices land somewhere between quarterly and twice a year, and the ones that cook daily or run a busy fridge sit at the frequent end of that. Somewhere in that range is a defensible starting point.

But do not set it and stop paying attention, because the real answer is that you already have a better signal than a schedule.

You will smell it before you see it

A kitchen that needs attention announces itself by smell weeks before anything looks wrong, and the smell is almost always the drain, the fridge seal, or something in the back of the fridge that has stopped being food.

If a kitchen that gets cleaned nightly smells at nine in the morning, the nightly clean is not the problem and doing it harder will not fix it. Something that is not on the list needs doing.

The cheap thing that works

A named day for clearing the fridge, and a person whose job it is. Not a sign on the door. A recurring calendar entry and a name against it.

It costs nothing, it prevents the single worst failure mode, and it is the one part of this that a cleaning company cannot do for you — nobody outside your office can decide whose yoghurt gets thrown away.