How often to wash curtains actually has no universal answer, but most expert sources agree on one rule: in an average household, washing every three to six months is sufficient. However, as cleaning expert Sara Aparacio notes, in homes with pets, smokers, or in urban environments, it should be done more frequently—meaning every three months. In the kitchen or bathroom, the interval is further shortened due to moisture and grease. The reason for such recommendations is simple. Curtains act like filters. They trap dust, pollen, smoke, and unpleasant odors, which over time can also affect indoor air quality. That is precisely why organizations like the American Cleaning Institute advise regular maintenance—not only washing but also occasional vacuuming or shaking between deep cleanings. When it comes to proper washing, the first step is always checking the label. Most lightweight materials like cotton or polyester can be machine-washed on a gentle cycle with cold water, while delicate fabrics such as silk or velvet require dry cleaning. Experts also recommend testing colorfastness and removing all hooks and accessories before washing. Drying is just as important as washing itself. Ideally, curtains should be air-dried, as high temperatures from a dryer can damage fibers or cause shrinkage. If you hang them back on the rod while still slightly damp right after washing, you can also avoid the need for ironing.