According to MIRROR

A homeowner has described how a simple and inexpensive kitchen staple helped prevent condensation and mould from forming on windowsills during the winter months. The method, which involves placing a bowl of salt on the windowsill, is presented as a low-effort way to reduce moisture buildup in areas prone to damp, particularly when daily wiping of condensation is impractical.

The account highlights how quickly mould can develop in domestic settings and how early intervention can prevent damage to household surfaces and furnishings.

Early Signs of a Growing Problem

The homeowner said the issue became apparent last month after noticing small green patches forming along a kitchen windowsill. On closer inspection, the patches were identified as mould, which had already begun spreading toward the surrounding wall and a nearby wooden shelf.

The discovery was unexpected, as the kitchen was cleaned thoroughly on a weekly basis. Despite this routine, the mould appeared to have developed rapidly and largely unnoticed. According to the homeowner, had the issue remained undiscovered for longer, it could have resulted in significant damage to the windowsill, wall coverings, and wooden fixtures, potentially costing hundreds of pounds to repair.

This experience prompted closer attention to the relationship between window condensation and mould growth, particularly during colder months.

Why Condensation Leads to Mould

Condensation commonly forms on windows during winter when warm, moisture-laden indoor air comes into contact with cold glass surfaces. As the air cools, it releases moisture, which settles as water droplets on the glass and surrounding frames.

When this moisture remains for extended periods, it creates ideal conditions for mould spores to germinate. Windowsills, corners, and areas behind curtains are especially vulnerable because they often stay damp and receive limited airflow.

If mould is allowed to develop unchecked, it can penetrate porous materials such as wood, plaster, and wallpaper. Once mould spreads beneath surface layers, remediation becomes more complex and often requires professional treatment.

Limitations of Daily Wiping

After identifying the mould early, the homeowner said they became more aware of the importance of wiping condensation from windows every day. Removing moisture manually reduces the time surfaces remain damp and lowers the risk of mould growth.

However, daily wiping is not always realistic, particularly during busy mornings or in homes with multiple windows. Missed days can allow moisture to accumulate again, restarting the cycle that encourages mould formation.

Seeking a more passive solution, the homeowner turned to a simple method that required minimal daily effort.

Using Salt to Absorb Moisture

The approach involves placing a bowl of cooking salt on the windowsill. Salt has natural hygroscopic properties, meaning it attracts and absorbs moisture from the surrounding air. By reducing humidity levels near the window, the salt helps prevent condensation from forming on the glass and sill.

To implement the method, the homeowner purchased a large 1.5-kilogram bag of cooking salt for under £2 and reused an old bowl that had previously served as a candle holder. The bowl was filled with salt and placed directly on the kitchen windowsill.

According to the homeowner, the setup took only seconds and required no installation or electrical power.

Monitoring and Maintenance

The salt bowl is checked daily. When the salt begins to clump together, it indicates that it has absorbed a significant amount of moisture from the air. At this point, the salt is no longer effective.

To reset the bowl, the homeowner rinses the salt under running water, dries the bowl thoroughly, and refills it with fresh salt. This process is described as quick and straightforward, taking only a few seconds to complete.

Since adopting this routine, the homeowner said the kitchen windows have remained dry, and no further mould growth has appeared in the surrounding areas.

Expanding the Method to Other Rooms

Encouraged by the results in the kitchen, the homeowner applied the same approach to windowsills in the bedroom and living room. Bowls of salt were placed on each windowsill, and the same monitoring process was followed.

After more than a month of using the salt method, the homeowner reported no new patches of mould in these rooms, suggesting that the reduction in condensation was consistent across different areas of the home.

Areas Where Salt Is Less Effective

Despite its success in living spaces, the homeowner noted that the salt method is less effective in rooms with very high humidity levels. Bathrooms and laundry drying areas continued to experience condensation due to frequent steam and moisture production.

In these spaces, the homeowner relied on ventilation rather than salt. Opening windows for approximately 10 minutes each day allowed fresh air to circulate and excess moisture to escape. This combination of passive moisture absorption in dry rooms and active ventilation in wet areas helped maintain lower humidity throughout the home.

Why Early Action Matters

The account underscores how quickly mould can establish itself once condensation becomes persistent. Even small, hidden patches can spread rapidly, especially in corners or behind furniture, where they may go unnoticed.

Mould growth not only damages surfaces but can also create unpleasant odours and contribute to poor indoor air quality. In some cases, prolonged exposure to mould spores may aggravate respiratory symptoms, particularly in people with asthma or allergies.

By identifying the issue early and addressing moisture levels, the homeowner was able to prevent further spread without resorting to chemical treatments or professional intervention.

Winter as a High-Risk Period

Winter is widely recognised as the most challenging season for condensation and mould control. Homes are typically heated while windows remain closed for long periods, trapping moisture indoors. Cold external temperatures make windows colder, increasing the likelihood of condensation.

The homeowner reported that, despite these seasonal challenges, no new mould spots had appeared after more than a month of using the combined approach of salt absorption and regular ventilation.

A Simple Preventive Strategy

The salt method is presented not as a replacement for proper ventilation or building maintenance, but as a simple preventive measure that reduces the burden of daily condensation management. It offers a low-cost option for households seeking to limit moisture buildup on windowsills, especially where wiping every day is impractical.

The homeowner emphasised that the simplicity of the method was a key factor in maintaining consistency. Because it requires minimal effort, it was easier to sustain over time than manual drying alone.

Conclusion

The experience illustrates how a common kitchen ingredient can help manage window condensation and reduce the risk of mould during winter. By absorbing excess moisture from the air, a bowl of salt placed on a windowsill can keep surfaces drier and prevent conditions that allow mould to develop.

Combined with regular ventilation in high-humidity areas, the approach helped maintain a mould-free environment across multiple rooms. While not a universal solution for all damp problems, the method demonstrates how early action and simple moisture control strategies can prevent minor condensation issues from developing into costly and difficult-to-treat mould infestations.