I don't have washing soda on hand. Is there anything else that will work? I do have baking soda and borax. I also have oxyclean, vinegar and bleach, but I'm pretty sure those don't work for hard water build up.
I noticed that my musty diapers are now reeking of ammonia.

I think it's the hard water build up and the extra detergent I was using to battle the must. Poo!
Re: Hard water build up.