How can you clean your system of marijuana in 1 week?

cant in a week but you can speed the process up from a month by sweating, THC is stored in fat cells so if you remove the fat the THC goes with it. but i doubt you will be safe for a test within a week. also if your peeing in a cup catch the middle of the stream in the cup not the first bit. the first bit of urine will contain the highest concentration of THC.