no offense to aaron ... but don't EVER drink vinegar n water for a cleansing (goldenseal doesn't work either). someone told my friend to do the same thing and he lost his job. screen came back dirty. there are various drinks out there that work. apparently they don't actually clean the urine, but somehow holds it back and allows the diluted (with drink) to pass first. my friend is on probation for mj possesion and has to do random screens and this "drink" works for him. he gets it at a local head shop. I will ask for the name and type back here as soon as I find out. supposedly mj stores in your fat cells and if you are a reg user, it can take 30 days to clean your sys, without additives. good luck!