Go stand in your drawing room. Put your palm flat on the top of the sofa back, where everyone's head lands. Rub it once.
Feel that faint stickiness? Dust does not feel like that.
That is oil. Yours, your father's, and every guest who has leaned back in that spot since the sofa came home. In a Patna house that means coconut, amla, sarson, whatever went into the hair that morning. It transfers on contact. It does not evaporate. It just collects.
It works harder than any shirt you own
You wash a shirt after eight hours on your body. The sofa takes eight hours a day too, from more people, and it has been on duty for years without a break.
Think about who sits on it. You at seven in the evening, in the same trousers that crossed Ashok Rajpath. Your kid, straight in from the lane, no change of clothes. The electrician. The cousin from Gaya who stayed four days. Every one of them leaves skin, sweat, and whatever their clothes picked up outside.
The bedsheet gets washed because you can see it. The sofa is dark, printed, and forgiving. So it gets a dusting and a straightened cushion, and that counts as cleaning.
The kitchen is in there too
In most Patna flats the kitchen opens straight into the sitting room. When mustard oil hits a hot kadhai it throws off a fine aerosol. That mist does not politely stay in the kitchen. It drifts out, lands on the nearest large piece of cloth, and dries into a thin sticky film.
That film is why your sofa grabs dust instead of letting it blow off. Wipe it with a dry cloth and the cloth comes back grey. Wipe it next week, same grey. You are not removing anything. You are moving it around.
August is the worst month for it
Patna holds above eighty percent humidity through August. Sofa foam is a sponge with a cloth lid on it. It pulls moisture out of the room, holds it, and lets it go slowly. Warm, damp, and fed a steady supply of skin flakes. That is exactly the condition dust mites want.
If somebody in your house sneezes every evening in the sitting room and nowhere else, stop blaming the fan.
Most covers come off. Go and check.
Tip a cushion on its side and run your finger along the back edge. There is almost always a zip hidden under a flap of piping. People own a sofa for six years without ever finding it.
If it zips, wash it.
Cold or lukewarm water. Never hot. Upholstery cotton shrinks, and the day you force a shrunk cover back over the foam is the day a seam gives. Machine on gentle, or a bucket with a small scoop of detergent and fifteen minutes of soak. Not overnight.
Do not wring it. Press the water out between flat palms. Wringing twists the piping and that cover never sits square again.
Dry it inside out. Six hours of direct Patna sun on the printed face takes more colour out than the wash does.
And here is the bit nobody tells you. Put the cover back on while it is still slightly damp. It stretches over the foam and dries to the shape. A bone-dry cover will fight you at the last corner and you will end up pulling on the zip.
The foam and the fixed parts
Foam cannot be washed. Water goes in fast and comes out over weeks, and in August it never really leaves. That is how a sofa starts smelling sour from the inside, and once it does, no spray fixes it.
Take the cushions up to the terrace instead. Beat them properly. Then stand them on edge so air moves across both faces. Two hours in a breeze does more than anything you can buy in a bottle.
For the parts that do not come off, work dry first. Brush out the seams and the crevices where a year of crumbs and hair sits. Then take a cloth, dip it in warm water with a spoon of mild detergent, and wring it until it is barely damp. Wipe one small section. Go straight over the same section with a dry towel. Then move on.
One rule holds the whole method together: the fabric should never get wet enough to change colour. If it darkens, you have put in more water than the foam can give back.
How often
Covers every two or three months. The headrest strip every month if oil goes in anyone's hair, because that narrow band takes most of it.
Watch the sky before you start. A cover washed on a Wednesday in a wet week goes back on damp, and your drawing room smells like a shut cupboard for a month. Wait for a dry stretch. In Patna you get one most weeks, even in August.
Cushion covers are heavy, awkward in a bucket, and slow to dry on a shared terrace. That is the whole reason they never get done. DoorWash picks them up from your door, washes and dries them properly, and brings them back ready to go on.
Unzip them tonight. The sofa is the one thing in your house that everybody touches. It should not be the dirtiest.