I found that using those antibacterial wipes on the rims and window ledges of windows stops musty or mouldy stuff in its tracks!! Now I get no probs at all and it keeps my sensitive to chemicals nose happy!!
Hey Joo I was watching that how clean is your house last week and they were cleaning windows with cornflour,they put a tablespoon of cornflour into a spray container full of luke warm water shook it up then sprayed it on the windows, wiped it with a cloth, then polished the window up with one of those fibre dusters and it came up a treat, I tried it and it really works good