i know this is boring...sorry! and i know i,ve read about this on here before, but cant seem to find anything about it at the mo. i live in a mega hard water area and want to try using vineger to soften my sons nappies...but cant remember how i'm supposed to do it. i,ve got the white vineger and tee tree oil at the ready, but need to know how much to use and also should i use it every wash?