JMF,
You’ve been watching too many “crime scene” movies where the FBI guy just “dials away” the extraneous noise leaving pristine, clear, audible dialogue of the Senator accepting a bribe. Truth is, in real life it ain’t that easy. (the audio… not the bribe!)
Sure, there are many tools you can use to “clean up” your audio tracks, but they all extract a price. Your original dialogue may be altered to the point that leaving in the background is a better option. Sound track Pro has a very capable “noise print” identifier/remover. But go easy on it. Filtering out this kind of noise really trashes the remaining audio. Good luck.
Mark