I clean my flat on Sunday mornings, and I have come to think of it as the only maintenance the house gets. Not because cleaning repairs anything, but because it is the one hour a week when I touch every surface, lift every object, and look behind things.

That hour is an inspection. The dust is incidental.

Dust is a map

Dust settles where air stops moving. That is the whole physics of it: particles stay suspended while air is turbulent and drop out where it is still.

Which means a dust line is a diagram. The tops of door frames, the corners of rooms, behind the radiator, the strip of floor under the bed, the top of the wardrobe. Those are the still places. They are also, almost without exception, the cold places — still air and cold air are the same air, and where it is cold, moisture condenses, and where moisture condenses, paint fails and metal rusts.

So the dust tells you where to look for the real problem. A ring of dust around the base of a wall is not a cleaning failure; it is a draught, or a cold bridge, or a radiator that is not doing its job.

Four things to check while your hands are already there

You are going to be crouching by the skirting anyway. The inspection costs no extra time if you know what you are looking for.

Joints and fixings. A wobbly chair leg, a hinge that has started to drop, a handle that turns a quarter-turn too far. All of these are five-minute fixes now and replacements in a year. The wobble is the notification; cleaning is when you receive it.

Seals. Window rubber that has gone hard, a fridge gasket that no longer grips a sheet of paper, the washing machine door seal with a black spot in the fold. Seals fail silently and expensively — a failed fridge gasket costs more in electricity in a year than a new gasket costs to buy.

Water. Under the sink, around the base of the bath, behind the washing machine, under the fridge. Water damage is the most expensive thing that happens to a house and it is always visible for months before it becomes damage. A damp patch under a sink is a washer; the same patch a year later is a cabinet.

The things you have stopped seeing. This is the one worth the whole hour. Every home accumulates objects that are no longer looked at: the vase on the high shelf, the ornament, the cable for a device you no longer own, the second set of measuring spoons. Cleaning is the only time they are picked up. Hold each one for two seconds and ask whether it has been used since the last time you held it. If the answer is no twice in a row, it has already left; you are just doing the paperwork.

The twenty minutes

The daily version is not a clean. It is a reset, and it has one rule: leave the room as you would want to find it.

Twenty minutes, one room, in this order — surfaces cleared, things returned to where they live, one cloth over the flat surfaces, floor. That is it. No products beyond one neutral cleaner, no schedule per surface, no colour-coded system.

The point is not spotlessness. The point is that a room left in a resettable state every day never reaches the state where cleaning becomes a project, and a room that never becomes a project is a room you keep using.

Care is material-specific, and short

Almost every care instruction reduces to one of four things, and the material tells you which.

Wood wants to be dusted dry, wiped with a barely damp cloth, and oiled once or twice a year. It does not want to be wet, and it does not want to be polished with anything containing silicone, which builds up and is impossible to remove.

Stone wants neutral pH and nothing acidic. Lemon juice, vinegar and most bathroom cleaners etch marble and limestone permanently. A ring from a glass on marble is an etch, not a stain, and it does not come out — it has to be polished back.

Linen and cotton want to be washed less often than people wash them, at a lower temperature, and dried flat or line-dried. Every wash removes a little fibre; a shirt washed after every wear lasts a third as long as one washed every three.

Lime, clay and unsealed plaster want to be left alone. No wiping, no scrubbing. A mark gets a coat of the same finish over it, and the mark disappears into the new coat.

The monthly pass

The daily reset takes twenty minutes; the monthly pass takes an hour per room and it is where the inspection happens properly.

Move everything. Not wipe around things — lift them. Every object on a shelf, every cushion, the plant, the thing on top of the fridge. This is the mechanism by which you notice things, and it is the whole reason cleaning is an inspection.

Work top to bottom. Dust falls. Start at the tops of door frames and the ceiling corners, then shelves, then skirting, then floor. Cleaning the other way round means doing the floor twice.

Long brush on the high lines. Tops of doors, picture rails, the top of the wardrobe, the top edge of the radiator. These are the still-air places where dust and moisture sit together.

Then the floor, last, with the cloth you have not used yet. A mop that has been used on the kitchen goes nowhere near a wooden floor.

Five jobs a year nobody schedules

These are the ones that cause expensive failures, and none of them are cleaning.

The extractor hood filter. A mesh grease filter washed every three months works; one left for two years stops the fan moving air and turns the hood into a noise. Charcoal filters are replaced, not washed, roughly annually.

The washing machine filter and door seal. There is a small filter behind a flap at the bottom front of every machine; it collects coins, hair and lint, and it will eventually block and throw an error. Empty it twice a year. Wipe the door seal's inner fold at the same time — that is where the black mould grows, and the smell people think is a broken machine.

The fridge coil and the seal. Vacuum the grille at the back once a year; a coil coated in dust makes the compressor work harder and shortens its life by years. Test the seal with a banknote: close the door on it, pull, and if it slides out easily the seal is gone.

The showerhead and the taps. Limescale halves the flow in two years in a hard-water area, and nobody notices because it happens slowly. Unscrew the showerhead and soak it in descaler for an hour. Same for the aerator on the kitchen tap.

The smoke alarms. Press the test button on the day the clocks change, in both directions. Replace the whole unit every ten years — the sensor degrades, and a ten-year-old alarm that chirps at 3am is telling you it has expired, not that the battery is flat.

What cleaning is not

It is not a moral act, and the tidiness of a house is not a statement about the people in it.

The useful version of cleaning is the one where you are holding an object and deciding about it — the one where the cloth is incidental and the inspection is the work. That version takes twenty minutes, it happens weekly, and it is the reason a house that is ten years old still works.