Do Quick Tabs work?

I am a regular smoker of marijuana and I need to take a UA on Monday and own heard of things called Quick Tabs that you can lug the day of the test beforehand and they are supposed to mask whatever toxins within your urine. I have a couple friends who say they enjoy taken them and say they work. Anyone else used them? What happened?

(Please no.." The best mode to pass a drug test is to not do drugs" comments. I already know that. =] appreciation! )
Answers:    I don't know about the brand Quick Tabs, but I think most of the stuff you can find contained by a head shop will work. Some of that stuff will show up on drug tests, too. If you're doing this for court, they may exam for those cleaners. If it's just for a job, afterwards they probably won't.

If you have 2-3 days, you can take cranberry supplement pills. THC is fat-soluble, so it take more than water. If you take an entire bottle of cranberry pills within 2-3 days, and drink a ton of water (to process the pills, I assume), it'll clean you out.