Does vinegar kill mould? What works and what doesn't
Sometimes, and only on the surface
White vinegar can kill some common moulds on hard, smooth surfaces, and a light, fresh patch on a tiled splashback or a painted window frame will often wipe away cleanly with it. What it can't do reliably is clear heavy growth, reach mould that has worked its way into a porous material, or do anything about the damp that let the mould grow. Think of it as a tool for small spots, not a cure.
Vinegar is a mild acid. That is enough to upset some surface growth, but results vary from one mould to another and from one surface to the next, and at home there's no way to tell whether you've killed the growth or simply tidied it up.
Surfaces where it's worth a try
- Glazed tiles, glass and the frame of a shower screen.
- Painted window frames and aluminium or uPVC sills.
- Hard plastic, such as storage boxes, laundry baskets and bath mats.
- Fridge and washing-machine door seals, after testing a hidden section first.
Keep it off marble, limestone and other natural stone, because acid can etch and dull the finish. On anything you care about, try a hidden corner before you start.
Where vinegar runs out of road
Plaster, grout, bare wood, wallpaper, mattresses and carpet are all porous. Mould spreads into them through fine threads, so wiping the face leaves growth underneath, and the dark mark tends to reappear in the same shape a few weeks later. That's the pattern behind grout that keeps turning black however often it's scrubbed.
Soft furnishings with more than a light bloom are usually better replaced than soaked in vinegar. The same goes for anything that still smells after it has been cleaned and dried.
Using it safely
Open a window first and wear gloves and a mask. Apply the vinegar with a cloth or spray bottle rather than scrubbing the mould dry, which sends spores into the air. Give it time to work, wipe the area clean, then dry the surface completely: leftover moisture is exactly what mould needs to return. The sharp smell fades as it dries.
Use vinegar on its own. Never mix it with bleach, which gives off harmful gas, and don't use the two one after the other on the same cloth or surface. If you've been reaching for both, read how bleach behaves on mould before you choose. Baking soda is the other popular kitchen-cupboard option, and it has similar limits.
Why the patch comes back anyway
Mould grows where there is moisture, and vinegar removes none of it. In Cyprus the usual culprit is condensation in winter: homes closed up against the cold, portable gas heaters adding water vapour to the air, and outside walls and window frames staying cold enough for that vapour to settle as water. Clean the patch without changing those conditions and it will regrow, which is why mould returns after cleaning in so many homes.
Airing rooms daily, drying laundry outside where you can, and leaving a gap between furniture and cold walls will do more over a winter than any bottle.
When to stop wiping
Put the vinegar away if the patch is bigger than your hand, comes back within weeks, sits on a wall that feels damp, or comes with a musty smell you can't place. The same applies if anyone at home has asthma or allergies; if they have symptoms, speak to your GP.
At that point, the useful question is where the water is coming from. The reason for the damp is pinned down before the mould is touched, so the work isn't undone by the next wet spell. Moisture readings on the walls you've been wiping show what's going on, with readings in every affected room and a written report with the quote. Growth that sits on the surface can then be cleared by a surface treatment for mould that won't shift, usually in one visit with no building work.
DIY not holding? book an inspection from €75 and we'll sort the cause, or call +357 99 759144.