Washing them inside out and in cold water helps preserve the color and prevents shrinking. It's also important to avoid using too much detergent, as it can cause the fabric to break down faster. When drying jeans, air-drying is the best option, but if using a dryer, use a low heat setting to prevent damage to the fabric. To keep the shape of jeans intact, avoid hanging them on a clothesline or hanger by the waistband, as it can cause stretching.