Add a bit of fabric softener and the towels will come out softer.
Tips
usage
Companion to 洗衣液 (xǐyīyè, liquid laundry detergent) and 洗衣粉 (xǐyīfěn, powder detergent). The verb 柔顺 also describes hair conditioning - 护发素 (hùfàsù, hair conditioner) is the personal-care equivalent.