>>3623332in OBS, there should be an option to set up a Noise Gate. it basically eliminates all background noise that falls under a certain threshold. again, there are some useful guides on how to set it up.
if you're using an nvidia 2000 or 3000 series card, there is
https://www.nvidia.com/en-us/geforce/broadcasting/broadcast-app/ which is extremely good at killing background noise, animal sounds, mouse clicks and keyboard clacks.
