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Yellowed curtains can be restored to white using a simple and inexpensive ingredient found in most kitchens. Bicarbonate of soda is effective in removing unpleasant odors and impurities. To clean curtains, mix warm water with bicarbonate and a gentle detergent, ensuring to check care instructions first. For added freshness, a small amount of white vinegar can be used during rinsing, but should not be mixed directly with bicarbonate. Regular washing every three to four months is recommended, especially for kitchen curtains or those in smoking areas. However, persistent yellowing may not be fully removable due to prolonged sun exposure or fabric aging.