I live in Wales. Our place has double-glazed windows. But we still have mold and mildew around the seams of the windows. I'm starting to see flecks on the net curtains. Is this typical? I've lived in wet climates before, but have never had mildew issues. How do you keep the mold away? I try to air out the rooms, we run the heat for a several hours a day, I wipe down what I can reach about once a week or so. Any more suggestions? Also, how do I wash the net curtains and how often do you recommend?