Just keep a bowl of salt, they said, as reported by The Mirror. Condensation happens when the warm air indoors comes in contact with the cool air from outside.

Simply fill a shallow bowl or a small jar with some salt - this can be table salt or rock salt. “The amount you use will vary depending on the size of the window you’re placing it next to.

Celtic sea salt contains trace amounts of healthy minerals, but its benefits do not differ significantly from other types of salt. Learn more about Celtic sea salt.

We compare different types of salt so you can tell the difference. If you've ever wondered, "What is ... sodium chloride and trace minerals, usually not iodized: sodium chloride and anti-clumping ...