Pure cotton curtains fabric is good at alkali resistance, which can be washed by soap or detergent. Water temperature should be controlled below 35℃. And the curtains can be soaked in warm water for 1 to 2 hours. But long soak in detergent is not suggested to prevent fading. And then clean water to rinse will be fine. Remember do not overexert when washing, in order to avoid the surface fluff. When ironing, the temperature should below 120℃ and mat with white clothe in case the curtain fading and affect the appearance. When drying, there is mildew on curtain, you can soak the curtain in diluent which is 20 grams ammonium hydroxide of 1 litre of water, and then rinse clean.