Thanks to Susanne Watson for this Frugal Baby Tip!
I’ve actually stopped using detergent all together, except every few weeks! It sounds a bit crazy, but my diapers smell cleaner than ever when they come out of the dryer. I also have a FL HE washer. I always use the Bulky cycle because it uses the most water. I do a cold/cold, hot/cold with ½ cup baking soda and cider vinegar in the fabric softener dispenser, and a 3rd cold/cold.