Despite what the labels might say on, like 99% of the dry shampoos on the market, the science behind Living Proof's Perfect Hair Day dry shampoo actually has been PROVEN TO CLEAN hair! That's because it contains as super molecule called OFMPA, which was created by cool nerds at MIT.
What it does is reduce the "surface friction on hair and helps absorb oil without adding grit." Add to that, it contains funky odor neutralizers to eliminate anything that could contribute to nasty hair.
Cost? About $22 at Sephora and other fine retailers.
If you're looking for a DIY alternative, click here.