Wash your load of towels on the hot cycle and add 1 cup of vinegar to the load. Do not use detergent or anything (especially bleach – that can be super dangerous!)… just hot water and the vinegar. Let the washer do it’s job. Then, if you still smell a little bit, rewash with just hot water and 1/2 cup of baking soda. I did not need to do this step but if your towels are bad, you might want to. Again, no detergent, just baking soda and hot water. Got it?
When your towels are done, throw them in the dryer. Done and done! They always come out smelling great and fresh!
This also works well on clothing, like stinky wet swimsuits that were left sopping wet out of the pool! Just be sure to be careful with the hot water and mixing colors. You don’t want the colors to bleed so do them separately or with very like colors.