The bowl of salt trick sounds wonderfully simple when your bedroom window is running with water every cold morning. You wipe the glass, open the curtains, and by evening the sill is damp again and… 

You wipe the black marks away, the window looks fine for a week, and then the mould is back in the corners of the frame and along the silicone sealant. Often there’s a faint musty… 

You run a 90°C cycle, fling the door open and expect that sharp “clean laundry” smell – but instead there’s the same sour, musty odour wafting out of the drum. If the machine smells fine… 

You wipe the glass every morning, but by breakfast the bedroom window is wet again and the window board feels clammy. In colder spells, you might even find little puddles on the sill or mould…