If you've recorded to wave format or can convert to wave then waverepair allows you to sample a section of NOISE ONLY from the source then experiment with degrees of noise removal until you get a good combo of noise reduction & sound quality. ALL noise reduction is a compromise.
waverepair costs about US$30 & is downloaded then run. It's great BUT is picky about wave files & the sampling rate.
Type it into your search engine, look it up & have a read.