a science hair blog I went to talked about using a dark beer rinse. the proteins in beer are fermented, therefore smaller chains that actually fit in the 'gaps' in your outer hair and not layered on top, so the finish is way better.
basically, wash rinse then squirt through dark beer, scrunch and let dry. I tried it that way, great result. I now do a beer/water rinse as I can only go 2 days then need to wash--thyroid issues.
the beer smell disappears completely when dry, I asked Everyone I saw the first time I did it. be careful not to drip it on your shirt!