Across TikTok, people have witnessed how the washing-up liquid hack prevents condensation from forming on any windows. The hack involves applying a thin layer of washing-up liquid onto a dry microfibre cloth that is then buffed onto windows.

Having been tested by numerous people, people are now being urged to stop using the hack. While effective, one plumber warned it could cause severe damage to your home and negatively impact your health.

Evan Jones, a bathroom specialist, warned: "While the videos clearly show that they are condensation-free, what they don't show is that the moisture that would have formed on those windows has now gone elsewhere."

The plumber said the moisture might seep into the walls and ceiling, which can lead to dangerous mould growth.

"Removing mould from your walls is more difficult than removing it from PVC," he said. "If the mould does develop in your walls then it could cost thousands to fix and could make you very ill in the process."

He also highlighted that window fitters and manufacturers advise against using washing-up liquid on windows due to potential damage to rubber seals.

"Failed double glazing can then cause moisture to develop in between your window pains causing the glass to fog up and mould to develop," he cautioned to the Manchester Evening News.

"Using washing-up liquid to prevent condensation can make the situation a whole lot worse."

Evan stressed: "If you are using washing-up liquid on your windows to prevent condensation you need to stop right away as there are better and safer alternatives that won't damage your home or your health."

To effectively combat condensation, dealing with existing moisture is key, according to Evan. "One of the best ways to safely remove moisture in your rooms is to use a dehumidifier," he said.

While acknowledging the expense, he noted that dehumidifiers can significantly reduce moisture and mould risk. For those seeking less expensive options, he mentioned non-electric interior dehumidifiers available for around £4.

They are packed with hydrophilic crystals that draw moisture from the air, tackling damp, mould, and mildew effectively. Simply place them by your windows to banish condensation.

Evan remarked: "Interior dehumidifiers are a much cheaper option than your standard dehumidifier and one device will last four to six weeks depending on how much moisture is in your home."