you can take niocine, which is found in redbull if not in the tablet form. As much water and cranberry juice as you can handel (roll around with gallons of water) i have had good sucsess with that and working out/ running. Cocain helps clear you out in good quantities (a ball or two over a 2 day period and a shit ton of water) but that a little extreme for passing a drug test for weed, but if you like coke its kinda fun hahha (cokes in your system for 3-4 days if you decide on that)