The first problem I see with this question is the lack of respect for your wife's point of view. The argument goes: I'm a minimalist, she hoards, ergo she needs to change. You feel she has no respe...

I haven't used any home remedies, but I did stop using shampoo and now only use an organic conditioner with tea tree oil and very little alcohol. It's so much nicer on my hair and doesn't strip it....