“This is where trickle vents are crucial. "They create a small opening above a window that acts as controlled ventilation, allowing continuous air circulation to expel condensation.

If your windows lack trickle vents, consider extractor fans as an excellent substitute to enhance air circulation, particularly in high-humidity areas like bathrooms and kitchens.

Winston said cleaning a trickle vent is easy enough with a good mould and mildew remover, which you can buy from as little as £1.19 at a number of retailers including Sainsbury's, B&M and Wilko.