Already been there and basically done that actually, but with rubbing alcohol and a pencil eraser.

If vinegar is used (yes I’ve done that before as well), then it needs to be followed by a baking soda/water solution to neutralize the acid.

I believe the remaining problem is a corroded via, which connects the layers of the board together.

It’s only a 2 layer board, so I might get it fully fixed one of these days. Totally within my skill set, just not high on my priority list…