Over time, towels build up detergent and fabric softener, leaving them unable to absorb as much water and smelly. Recharge them by washing them once with hot water and vinegar, then a time with hot water and half cup baking soda. This strips the residue.
This works amazing! Frugal Living: Homemade Carpet Stain Remover - 1 TBS Vinegar, 1 TBS Dishsoap, 2 Cups Warm Water Blot spot with recipe than dab with dry towel. THIS IS AMAZING! Took coffee stains out of my white rug!