Dude, if it's a hair you're worried about, ummm, nothing I've ever heard of is going to help you, aside from time. A hair test covers a time period of up to 90 days.
Hate to pee in your Cheerios but hair and spine tests, to the best of my knowledge, are unfixable. Sorry man. Good luck.
Read more about it at Omega Laboratories*-*Hair Testing FAQ