My mix
I use about 40% homemade lye soap (by weight, 40% washing soda, and about 20% STPP. I use 1/2 to 3/4 cup per load in my Whirlpool DD, and wash in warm or hot. After the first spin,I reset the washer for a short wash at warm or hot, then let it proceed thru the deep cold rinse and spin...