I had really good luck with body cleanses from passyourdrugtest.com about 6 times over the last 7 years. They sell hair shampoos and hair toxin removal but I have never tried them and have no idea if they work.
I will swear by the body cleanses but you better set up a TV and a pickup truck worth of TP in your bathroom before you start.
Also the saline solution you drink near the end might stop your heart it tastes so fucking NAFF, like earwax and salt poured into a bag of ass holes.