If you're a very light user, then maybe you'll test clean after 62 hours. Like we. Just make sure you get a drink that's suitable for your body mass. If you still test positive for drugs after 62 hours, it's time to put this plan B into action. If you're a . If you're worried about failing a drug test for methamphetamine, you're probably wondering how you can quickly clean your system. There's a lot of . I took meth been but off week had little none few days. Took drug test showed meth and cocaine. I do not do coke. Not used anyone pipe. J Anal Toxicol. 2011 Jul;35(6):333-40. Zinc reduces the detection of cocaine, methamphetamine, and THC by ELISA urine testing. Venkatratnam A(1), Lents NH. Wait Until The Drugs Clear Naturally. Drugs will naturally clear out of your system over a period of time. The time frame to pass a urine drug test can be from a . Mar 5, 2012 . Crack can stay in your system for days to weeks after use. for trying to clean the system of drugs or advocate for trying to fool drug screens. Cocaine itself is impossible to test for, it's in and out your system in less to convince the drug tester that I was clean (he really was) because of ..