As temperatures drop and UK homes heat up, the seasonal battle against condensation is back. With mould concerns rising and energy costs still high, many homeowners are turning to low-cost “hacks” circulating on social media from bowls of salt to chalk sticks taped to window frames. But do these tricks actually work?
A closer look at the most popular methods shows that while some can help in small spaces, none replace proper ventilation or consistent indoor temperatures. Here’s how the trending hacks compare.
1. Vinegar Spray
Claim: Stops condensation and mould on window frames and glass.
How it works: Vinegar won’t prevent condensation, but it can kill mould spores and remove black spotting. Some users spray a diluted vinegar solution on frames each morning to slow mould regrowth.
Does it work?
Partially. Vinegar is a good mould-killer, but it does nothing to reduce moisture in the air.
Best for: Treating mould after condensation has already appeared.
2. Bowls of Salt
Claim: Salt absorbs excess moisture from the air.
How it works: Salt is hygroscopic and can lift humidity levels slightly in enclosed spaces.
Does it work?
Only in tiny rooms. A bowl of salt won’t noticeably reduce moisture in a bedroom or living room.
Best for: Cupboards and very small spaces.
3. Chalk Sticks
Claim: Chalk absorbs moisture and prevents windows misting up.
How it works: Chalk absorbs a small amount of water vapour.
Does it work?
Hardly at all. The absorption level is minimal and won’t impact whole-room humidity.
Best for: Wardrobes and drawers.
4. Cat Litter (Silica Crystals)
Claim: Works as a cheap DIY dehumidifier.
How it works: Silica gel is an effective desiccant that binds moisture.
Does it work?
Surprisingly well but only in modest areas. Better than salt or chalk, but still no substitute for mechanical ventilation.
Best for: Small rooms or hallways.
Expert View
Colin Greenslade, founder of Colin’s Sash Windows, says homeowners often turn to hacks because they want a quick fix but the science is simple.
“We see the same issues every winter. Salt and chalk can absorb a tiny amount of moisture, but they don’t address the real causes. Condensation happens when warm, moist air can’t escape or hits a cold surface. Good ventilation and steady heating make far more difference than any bowl of salt ever will.”
Colin Greenslade, Founder, Colin’s Sash Windows
What actually helps with condensation?
1. Short bursts of ventilation
Opening windows for 10–15 minutes twice a day clears humid air without losing too much heat.
2. Extractor fans and trickle vents
Removing steam at the source is one of the most effective long-term solutions.
3. Consistent heating
Temperature swings cause windows to mist up. A low-but-steady heat level reduces this.
4. Dehumidifiers
Still the most reliable way to control indoor moisture levels across a whole home.
Bottom line
Salt, chalk, vinegar sprays, and even silica cat litter can assist in tiny pockets of the home, but they won’t prevent whole-room condensation. For real results, homeowners need ventilation, extraction, steady heating, and where needed, a dehumidifier. The trending hacks may grab attention online, but experts are clear: proper airflow beats quick fixes every time.
