Even if you follow our diaper-washing recipe to the letter, a breastfed baby will still leave behind harmless light-mustard stains on the diaper. So, we recommend Bac-Out by Bi-O-Kleen, which is a natural enzyme cleaner. Bac-Out attacks proteins left behind from food stains and odors, including mildew, eliminating the most difficult, organic stains, odors and waste the way nature intended. Bac-Out is a very unique blend of natural living enzyme cultures and botanical extracts, with more strains of cultures for more effective performance than commercial brands. Coffee, berry, blood, mustard, tomato and many other difficult stains and odors are no match for Bac-Out. Gentle on babies skin, tough on stains and odors. Great for diaper pails too! $7.95 for a 16 oz. bottle. Made in USA.