The rinse cycle, but you clothes won’t smell like vinegar. Also, vinegar is naturally anti-microbial, bacterial and viral. You can use it in a spray bottle instead of Lysol or other cleaners. It works beautifully for windows. Mix one part vinegar to two parts water and wipe away with old newspapers. Your windows will gleam.
I have used vinegar as well but my Dad, a chemistry teacher, warned that it is corrosive and will eventually wreck the metal parts of my washer. How long have you been using vinegar in the rinse cycle?