Hello
I’m completly novice and I need to clean a short interview. I’m ok to pay a reasonnable price via paypal to somebody really competent.
Thanks
…That’s not a job for me… Maybe some someone here will take “quick shot at it” for free??? Of course, we can give you free advice. 
Most of use here do this stuff 'cause it FUN!
Can you [u]attach/upload[/u] the file (or a short selection from the file) so we know what you are dealing with.
The problem is, if the recording is very-bad there’s probably not much you can do. 
Maybe it could be improved, but there’s a good chance you won’t be happy with the results and you’ll feel ripped-off. Even with the latest pro software, pros still record in soundproof studios with good equipment, good mic positioning, and good talent, etc. “On location” movie dialog is re-recorded in the studio, because it’s impossible to make a good recording from a bad recording.
And, this stuff tends to be VERY time consuming. It could easily take half a day to “clean-up” a half-hour interview… You’ve got to listen-through before you start, listen as you are “cleaning-up”, and listen again to the result. That’s an hour-and-a-half or 2 hours minimum for a half-hour audio program. A plumber or auto mechanic charges about $100 an hour… I’d probably do it for half that, but I’m NOT taking the job… Now, do you still want to hire someone?
Post a piece of the raw work. We may be able to just tell you how to clean it. Include a second or two of Room Tone (no words, just background) and then some performance. You can’t attach very much.
https://forum.audacityteam.org/t/how-to-post-an-audio-sample/29851/1
I’m completly novice and I need to clean a short interview.
Cellphones make sound recording seem a lot easier than it is.
Koz