PD 9 has WAVE Editor, which can do a better job of cleaning audio.
WAVE Editor also takes VST plug-ins, which can do tons of things to sound.
Audacity freeware also is quite good.
You may never get your audio the way you want, though, and I can't stress enough to budding video Masters, sound is EXTREMELY important, and lousy sound will drive a viewer away almost as fast as lousy video quality.
HP Envy Phoenix/4thGen i7-4770(4@3.4GHz~turbo>3.9)
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Canon Vixia HV30/HF-M40/HF-M41/HF-G20/Olympus E-PL5.
Tape capture using 6 VCR, TBC-1000, Elite BVP4+, Sony D8 camcorder with TBC.
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