i agree its just dilution, ive had random drug tests for the past 5 years. i know people that use the certo method or some detox from the hindu store on the corner but its all dilution. in my experience drink lots of water, its the only way your gonna pass if you dont stop smoking, and its still not a guarantee. if you know they test for dilution make sure your creatine levels are up. as for color ive heard b vitamins but never worked for me when i just drank a shitload of water. nobody has ever asked me about clear urine but if they do , i only drink water simple as that.