Be sure you are using White Distilled Vinegar, nothing else! Use about a tablespoon per towel in the rinse. Since most people use way too much detergent the vinegar allows all fabrics to shed any excess in the rinse. This allws the fibers to be truly shed of any detetergent which in turn makes them "feel" softer. Distilled vinegar is the oldest and best "fabric softener" there is. You can use it on everything in your wash with great results... and no, no vinegar smell. By the way, it is also a natural disinfectant for all around the house... mix 1/3 vinegar - 2/3 water and wipe down kitchen counters, sinks, toilets, etc.