if its just a at home drug test then bleech will work. what i do when i got drug tested at my home last year is take a small travel size visine or any eye dropper bottle. fill it about a quarter of the way with bleach. then when your urinating in the cup just put 2 drops of bleach and you will be all set. the bleach method will only work with at home tests because there is no ph tests. bleach will fuck up the ph levels extremely, but there is no need to worry if its the at home test. just another option you can think of. i was drug tested about 10 times and smoked the day before a couple of the times, and have never failed.