Quicktime recording: help, I did 1/2 of an interview with my headphones on, interviewee can barely be heard :(

I did a horrible newbie mistake. Recorded about half of a really cool interview with my headphones on, without realising it. I can hear my voice, coffee shop noise, and very very light sounds from the interviewee. Is there a way I could clean the noise to only get the interviewee? So sad.