Mould on fabric is harder to deal with than mould on a tile. Here is how to decide what to clean, what to throw away and what to fix first so it does not come back.
Hard surfaces can usually be cleaned. Absorbent items such as carpets, soft furnishings and mattresses may have to be thrown away if mould has taken hold, because it can be difficult or impossible to remove completely. Washable clothes can be tried once. Whatever you decide, find and fix the damp source first, or the mould will return.
White, green or black speckles on the back of a wardrobe door, a musty patch on a carpet under a bed, mildew spots on clothes at the back of a cupboard, or a sofa that smells stale after being pushed against an outside wall. The pattern matters: mould on fabric usually sits where air barely moves and a cold wall or floor sits behind it.
Cambridge City Council notes that damp from excess condensation can lead to mould on walls and furniture and mildew on clothes and other fabrics, and that condensation is often found in corners and behind wardrobes and cupboards. GOV.UK guidance also warns that a mould smell can mean mould hidden behind a surface, including the underside of carpets and behind furniture.
Work down the list in order. Do not start by buying new carpet or a new sofa.
There is no special local rule for mould on fabric. Ashford has older terraces, converted houses and newer estates such as Kennington and Willesborough, and the trigger is the same everywhere: warm moist indoor air meeting a cold wall or floor with an absorbent item pressed against it.
A dehumidifier cannot clean a mouldy carpet or sofa, and it does nothing about a leak. If the damp comes from a gutter, a roof, a pipe or the ground, fix that first. If you rent and cannot change the structure, a portable dehumidifier is a more realistic option than a loft-mounted system. A Dryzen unit needs a loft and is not suitable for rentals unless the landlord authorises the changes.
A Dryzen system is a loft-mounted dehumidifier with insulated ductwork to the central area or stairway of the home. Each unit covers 150 square metres and extracts 12 litres a day, using about 20 pounds a year in energy. When condensation is the cause, a steady humidity around 50 to 55 percent helps stop the conditions mould needs, and the target can be adjusted in the app. It does not remove existing mould, which must be cleaned off or the item replaced. A free survey can measure humidity through the day and tell you honestly whether a system would help.
If a washable item comes out clean and the damp source behind it is fixed, that is a reasonable outcome, but follow the care label and bin anything that stays marked or smells. If you have symptoms such as a cough or wheeze, speak to a GP or pharmacist, as GOV.UK guidance advises seeking healthcare advice rather than waiting.
GOV.UK guidance says absorbent materials such as carpets and soft furnishings may have to be thrown away if they become mouldy, because the mould can be difficult or impossible to remove completely. A small patch on a hard floor is a different matter.
No. Existing mould has to be cleaned off or the item removed. A dehumidifier only helps stop the conditions mould needs, and only when the moisture comes from condensation rather than a leak.
Sources: GOV.UK: Understanding and addressing the health risks of damp and mould in the home; Cambridge City Council: A guide to managing condensation and mould in your home
Last reviewed 2026-10-25. General guidance only; this is not a survey of your home.