I was told by my dermatologist that the laundry detergent least irritating to the skin was one for infants clothing, called Dreft.
https://www.dreft.com/en-us/washing-tips/detergent-tips/dreft-baby-laundry-detergent
https://www.dreft.com/en-us/washing-tips/detergent-tips/dreft-baby-laundry-detergent