How to clean out your system out of THC?

Just need to know how to get thc out of my system. I know water, niacin and all that stuff works. Ive heard of other things like vinegar and stuff like that. What are some other ways? and does swimming in a pool clean out your system? I have a week to get clean and ive smoked maybe twice in the past week and its all been swag so its not as potent as hydro