Cleaning up my music library

Hi, and thanks for reading.

I’m on Windows 10, using Audacity 2.1.2 installed from the .exe installer. I downloaded the program to clean up some issues in my music library, mainly clicks. Another recording I have has a sort of “squealing” sound to it, and I’m not sure how to fix it. I’ve attached a one-second extract for reference.

When I looked at the waveforms, I guessed that the source of the squealing is the rapidly undulating wavy bit in the bottom track (right channel), so I went ahead and muted the left channel and used the draw tool to smooth out the right track (bottom of the picture).
But when I play the edited track (with the left/top channel muted), though the squealing is decreased, it is still very noticeable. Here is the original extract:

Here is my edited version:

If anyone has any pointers about what I’m doing incorrectly, I’m all ears.

If you look at the spectrogram view there is a white-hot [loud] noise at 0.6s ~10kHz …
Tweet noise at 0-6sec, 10kHz.png
[ It sounds like a tweet if you play the track at half-speed ]

You can remove it using Audacity’s spectral edit tools

Thanks, that sounds a lot better.

I appreciate the links and pictures. Being so new to this, I don’t even have the vocabulary to know what to ask about.