Bikram Yoga emphasize heat for detoxification and deeper stretch. 104 F maybe beneficial for releasing toxins from the body since  heat frees toxins from the fat cells where they are stored, they moved to the bloodstream where they are flushed out of the body in perspiration, urine, bile and other body fluids.On the other hand, one can stretch further on a relatively warm temperature (75-80 F) as well. 

Also, hot/humid condition results in higher heart rates when compared the same exercise in a cool environment. Therefore, there is a cumulative increase in heart rate between efforts and thus recovery is not complete. This puts stress on the cardiorespiratory system.

If you want to detoxify I suggest a hot or dry sauna. To be on the safe side practice ashtanga, vinyasa, hatha yoga etc.

ka

1. Khron J. and Taylor F. Natural Detoxification. A practical Encyclopedia. The complete guide to cleansing your body of toxins. 2000