Theres no products, liquids, etc that can rid the body of THC. THC is fat soluable, not liquid soluable. Only time and fat-burning exercise can rid the body of THC.

You passed because your urinestream was diluted from consuming the fluids - diluted enough to test negative, but not enough to be rejected for being overdiluted. You could accomplish the same thing by following N2's Dilution thread in the stickies.