If you're looking to strip your towels without borax, there are a few methods you can try. One is to use white vinegar and hot water. Simply soak your towels in a mixture of one part vinegar to four parts hot water for about an hour. Afterward, wash them as usual with detergent. Another option is to use baking soda. Make a paste out of baking soda and water, then rub it onto your towels and let it sit for 15 minutes before washing as normal. You can also add a cup of baking soda to your regular load of laundry when washing towels.