Recently I learned a very useful tool in Audition; the Noise Reduction Process. This came in very handy when editing a podcast and there's a lot of bad white noise in the background. Well, this effect saves the day! If I select a piece of white noise from an episode (it has to be only white noise by itself) then right-click it and click "Capture Noise Print", then select the whole episode (or wherever you want it to take out the white noise), then go to the "Effects" rack, then select Noise Reduction/Restoration > Noise Reduction (process), it'll lead me to the control panel where I take it out.
It should look like this: