I use baking soda in practiucally every load! I get the Arm and Hammer bag found in Wal-mart in the pool section. I know it works when it gets the "ship and fuel" smell out of my husbands work clothes! The back of the bag recommends 1 cup in a full load. I will use a 1/3 cup for a small load of children's/babies clothes and 2/3cup for medium loads.