Christophe Robin Brightening Hair Finish Lotion with Fruit Vinegar

Don't let the vinegar scare you, this is nothing like salad dressing. Instead, it's a great leave-in spray that helps purify but also detangle and condition with chamomile.  The vinegar reportedly helps remove impurities left on the hair while its acid pH (4.5) enhances shine and protects your highlights or color.  For non-blondes there are other formulations, too, also with vinegar, including a sage and a hibiscus version. $48 at Sephora and Saks.