If the glue will melt, you could try this - it is the same method used for removing molten wax from a surface without scrtching it off.
Place several layer of absorbent paper or cloth on top of the glue (newspaper is fine for way - not sure about your glue) Place a hot iron on top of the and press down firmly. The heat should melt the glue which is then absorbed by the paper/material, leaving you with bare board - rubbing with white spirit or similar shoudl remove and ingrained glue.