Fabric Removal Question

Have removed the fabric from the wings of a 1950's wooden glider and would
like some advise please.

The fabric was obviously stuck to the wood with adhesive, after removal of
the fabric I am left with a hard residue coating of adhesive on the wood,
has anyone any tips on the best means to remove it?

And preferably the easiest?

For info I'm located in the UK.

Thanks

Dave