Acoustic guitar squeaks? The spectral display in most DAWs will make location super easy...once you know the signature colour and intensity.
After location I've opted for pre FX volume automation in some circumstances or EQ automation in others.
It is a bit like de-essing in that you can VERY easily overdo it and make the result sound unnatural.


Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe