In winter, if the sweater is worn every day, it is best to wash it once a week to two weeks. If you change it after two days of wearing, you don't have to wash it too frequently, so as not to affect the warmth retention. To keep the original shape of the sweater, wash it according to the fiber properties of the sweater, and pay attention to the detergent and water temperature.
Before washing a sweater, you must first understand the fiber properties of the sweater. Sweater fabrics include woolen sweaters, cashmere sweaters, and wool blended sweaters. Regular manufacturers mark the fiber content on the clothes. Both wool and cashmere are protein fibers, which are acid-resistant and not alkali-resistant, and sweaters are prone to shrinkage and deformation. Most of the blended sweaters are blended with wool and chemical fibers. Such wool fabrics are low in cost and have higher wear resistance than pure wool sweaters.
When washing pure wool sweaters, it is best to go to professional laundromats for dry cleaning. After dry cleaning, the style and characteristics of the original clothes can be maintained, and it is also the best washing method for sweaters. If you wash pure wool sweaters at home, try to use a detergent with a neutral pH value to avoid damage to the wool fibers. The water temperature should not be too high, just keep it around 35 degrees Celsius. Soak the sweater for 25 minutes, then gently squeeze the sweater with your hands to squeeze the dirt out of the sweater in the water. Just rinse it three times with clean water, and finally spread the sweater flat and dry it on a wide hanger. When washing blended sweaters, the requirements for detergent are not too high, as long as they are washed according to the above method. Do not wash sweaters in a washing machine, especially a domestic turbo washer, and do not dry them in a tumble dryer.