I'm not really sure. I have some friends that swear up and down that bleach works, a cap full in a gallon of orange juice followed by massive amounts of water, once you piss clean then you are clean...at least thats what they say and i havent heard of any of them failing a test, they're all employed at some pretty good place actually. i say that you can try it but most of them do it the night before the test so im not sure if your gonna have enough time or not. read up on dillution methods if you dont want to take the risk. i cant tell you that bleach is gonna work b/c i havent tried it yet though i will be in the near future. let me know how it goes. hope this was helpful