Why a Well-Kept Couche Earns Its Keep

A linen couche is the quiet workhorse of a sourdough kitchen. It cradles shaped loaves through their final rise, wicks moisture away from the surface of the dough and helps build the skin that later blisters into a proper crust. Treat it well and the cloth develops a floury, slightly stiff patina that experienced bakers genuinely prize. Treat it badly and you will find grey speckles, a sour smell and a loaf that refuses to release cleanly.

There is no great secret to it. The whole routine takes two or three minutes after each bake, and it is mostly about two things: keeping the cloth dry, and keeping the flour on it loose rather than caked. Bread cloths are not fussy, but they are absorbent, and anything absorbent that gets put away even slightly damp will eventually go mouldy.

The Two-Minute Ritual After Every Bake

Do this before you sit down with your first slice. Once the loaves are out of the cloth, take it outside, or lean over the bin, and give it a good shake. You are not trying to get every grain off, just the loose stuff. Then take a stiff brush, a dedicated pastry brush or a clean nail brush kept for the purpose, and work along the cloth in long strokes. Flour that has clumped into little pebbles should be brushed away rather than left to harden into the weave.

• Shake the cloth briskly, outdoors if the weather allows.
• Brush off loose flour and any dried dough flakes with a stiff, dry brush.
• Do not scrub at sticky patches while they are still wet; let them dry first, then brush them away.
• Hang the cloth over the back of a chair, a drying rack or a banister in moving air.

Never fold a couche and put it in a drawer while it still feels cool or clammy to the touch. That single habit causes more mould than anything else. If in doubt, leave it hanging overnight.

When a Cloth Genuinely Needs Washing

Most couches should be washed only a few times a year. Over-washing strips out the flour seasoning and leaves the linen limp and less effective at preventing sticking. Wash when the cloth smells sour or cheesy, when grey or black patches appear, or when it has become so stiff it cracks instead of draping.

When the time comes, use lukewarm water with a small amount of mild, unscented soap. Hot water can set starches and shrink linen, and fabric conditioner is entirely the wrong thing here: it coats the fibres and stops them absorbing moisture, which is the whole point of the cloth. Rinse thoroughly until the water runs clear, then press the cloth between two dry towels to blot out excess water. Never wring a couche; you will distort the weave and leave permanent creases that mark your dough.

For mildew, soak for half an hour in one part white vinegar to four parts cool water, then rinse and dry in direct sunlight if you can. The combination of acid and ultraviolet light usually shifts a light bloom of mould. Deep black staining that survives that treatment means the cloth has had its day, and it is better repurposed as a rag than trusted with your dough.

Drying Is Where Most Cloths Are Ruined

Airflow matters far more than heat. A warm, still room will dry a cloth more slowly than a cool, breezy one. Lay the cloth flat or hang it so that air reaches both faces, and turn it once or twice during the day. A full twenty-four hours is not excessive in a British winter, especially in a kitchen where the kettle is always on.

Radiators work, but drape the cloth loosely rather than pressing it flat against the metal, and move it once the room cools so condensation does not settle back into it. Test before storing by pressing the back of your hand against the middle of the cloth. If it feels even faintly cool, it is still holding moisture. Fold it only when it feels dry and slightly crisp.

Storing Between Baking Days

Storage is about breathability. Roll the cloth loosely rather than folding it into tight squares, and keep it in a dry cupboard or a cotton drawstring bag. Plastic bags and airtight boxes trap any residual moisture and are the fastest route to a spoiled cloth.

• Roll loosely in a cylinder; tight folds create damp creases that mould loves.
• Store in a cotton bag, a pillowcase or simply on an open shelf.
• Keep away from damp walls, window sills and the cupboard under the sink.
• Do not store alongside onions, potatoes or anything else that releases moisture.
• Keep cloths used for covering dough separate from drying-up towels, which carry grease and food smells.

A Routine That Keeps Everything Sweet

Shake and brush after every bake. Hang to dry overnight, always. Check the cloth with your hand before it goes away. Once a month, unfold everything, give it a sniff and a look in good light, and hang it in the air for an hour or two even if it has not been used.

Do that and a good linen couche will serve you for years, improving all the while, and your loaves will slide free with a whisper rather than a tug.