Soak in Oxi clean then launder with bleach and hot water.
Carol: Soak in Oxiclean overnight. Turn them occasionally.
I like liquid bluing. It works miracles on dingy towels. https://www.amazon.com/Mrs-Stewarts-Concentrated-Liquid-Bluing/dp/B009M7ESPA/ref=sr_1_4?keywords=bluing&qid=1557310980&s=gateway&sr=8-4
i use oxi clean white revive - soak and wash, then use weekly
Thank you - have never used the white revive. Will give it a try
I soak old linens in Oxiclean and hot water overnight in the bathtub.