I heard kern's jelly mix works wonders too.
Can be found in almost any grocery store. put a pack in a glass, fill with water, drink. repeat this till all the mix is gone. Piss before the test and you should be alright.
Only suggesting this because I've seen it work with friends of mine that had to pee for probation, not sure how it'll take for you.
Also, you can find personal detoxification kits at almost any head shop, even some gas stations. Following the instructions on them (and staying clean 72 hours prior to them) tend to work excellently. I'd suggest a head shop as opposed to a gas station, never know what kind of stuff the gas station picks up.
anyways, that's my 2 cents
