Homeowners battling foggy windows and the threat of mould now have a remarkably simple and cheap solution at their fingertips, thanks to a clever cleaning tip from an expert.
The Simple Hack That Beats Condensation
Cleaning guru Nancy Birtwhistle has demonstrated a highly effective method to keep windows clear of condensation for extended periods. The secret weapon is a common kitchen staple: eco-friendly washing-up liquid.
In an Instagram video shared on December 3, 2025, Birtwhistle explained the process. She advised applying just a single drop of washing-up liquid to a paper towel, then wiping it over a window pane while mopping up any existing moisture. According to her findings, this simple action prevents the glass from steaming up again.
How This Household Staple Creates A Protective Barrier
While it may sound almost too straightforward, the science behind it is sound. As reported by the Express, washing-up liquid works by leaving a thin, invisible layer on the glass surface. This layer reduces the surface tension of water, which stops moisture from the warm indoor air from beading up into droplets when it hits the cold glass.
The result is a clear view and a significantly drier window frame and sill, removing the damp conditions that mould spores need to thrive and spread to surrounding walls and furnishings.
Long-Lasting Results On A Tight Budget
The most impressive part of this hack is its longevity. Nancy Birtwhistle reported that her own windows remained completely clear of condensation for over two weeks after a single application. It was only after three weeks that she noticed a small amount beginning to form around the very edges of the glass.
This offers a powerful, budget-friendly alternative to daily wiping or the expense of running a dehumidifier. Birtwhistle also confirmed the same method works brilliantly for clearing and preventing condensation on the inside of car windows, a common winter frustration.
The hack has already been tried and praised by many of her followers, proving its effectiveness in real-world UK homes during the chilly, damp winter months. Tackling condensation proactively is crucial for maintaining a healthy living environment and protecting your property from mould damage.
