A problem I see over and over again in these types of discussions is the tendency to use anecdotal evidence or tribal knowledge rather than data. People cannot agree on what cleaner/wax to use let alone how to approach board repair.
I will add as a chemist/materials scientist that neutralizing with acid is a sound approach because when you lower the pH of Cu you tend to reduce the oxidation state.
I will also add that i appreciate both of your efforts and expertise.