Actually there are certain frequencies that will create that kind of effect. Noise repair tools wont help in this situation.
Generally harsh frequencies can be found around 3-5kHz, sibilance 6-10kHz and the nasal sound around 900Hz-2kHz. What frequencies you address really does depend on the subject.
In general, once you find the irritating frequencies you can use a standard eq to “notch them out” and pull them down a bit. Too much can have detrimental effects to the quality of the audio. Not enough nasal frequencies and a voice can lack presence, not enough harsh frequencies and a voice can sound dull and not cut through enough, not enough sibilant frequencies and a person can sound like they have a lisp.
If you find you need to pull more frequency content out, but it is having a negative effect on the overall sound, then you need to back off the eq till it sounds reasonable and use a dynamic eq on top of that. Something like this for example. They generally don’t comes standard so you may have to purchase one.