I had to match audio and clean up the some background noise after shooting in a very challenging environment. What did I do? Eliminated the buzz of a fridge and then I had to Frankenstien audio together in order to convey a conversation, since these were two different interactions. 

I uploaded the audio to Adobe Audition and had to use isolate the sections of the noise print where the buzzing was the loudest. I also silenced parts where other voices were heard. I then amplied the voices and added the voices in later.