Hi all! I don’t know if this “counts” since it relies on electricity but I recently purchased an ozonator that goes in the cold water line before the washing machine. It adds ozone to the water which shifts the ph and makes it so you can wash all laundry in cold water without detergent. I am quite happy this far with how it works. My dream is to capture rainwater for laundry and then to pump it out into the garden after washing with it. The product I purchased is called o3 waterworks, if you are curious. I am definitely going to try some of the suggestions in this thread for any extra stinky stuff!
