Dry cleaning without chemicals is recommended, each 8 months or so, depending where you live.
For a proper look, you should choose curtain/panel width 1.7 more than the width of your window or space (window plus walls). For example, if your window width is 200cm, you need at least 2 panels, each with a size of 170cm (ideally each 200cm or one 400cm), because when the curtains are folded in waves, its width decreases 2 times.
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