Can this audio be cleaned up?

I have a couple of minutes of footage (that I have to use and cannot reshoot or dub) that was recorded in a tiny bathroom. There is some echo, but that is the least of my problems. The big problem is the bathroom fan was running during all of the takes and the sound of that hum is brutal.
Here is a 24 second sample: http://www.offstagefilms.com/files/soundtest.aif
I tried sending the sound file to SoundTrack Pro to remove the noise, but the results weren't great.
I have spent the last 3 hours playing with the Audio Filters in FCP. I am stumbling around in the dark and occasionally a filter does seem to help. I have had some luck with the following (even though I don't know exactly what they do):
Hum Remover
Parametric Equalizer
Band Pass Filter
But I can't seem to find the best combination. My ears are numb at this point.
I realize there is no perfect solution (bad audio is bad audio). But I was hoping someone out there who is better at this than me (most of you), could take a moment to listen to the file, try a couple of things, and offer me some specific suggestions.
If someone can help me out with this, I would really, really appreciate it.
Thanks,
Chris

Hi Chris,
Check out _This Video Tutorial_ that shows you how to send your audio file from FCP to Soundtrack Pro where you can set a noise print and then reduce noise. You mentioned that you've already attempted this technique but you may want to try playing with the threshold and bass/tremble preservation in Tone Control to get better results.
hth

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