removing 78-1175 grease seals from rear brake hubs... what's the trick ?

[Jake's 40]

no luck checking my Clymer Service Manual book and searching here only turned up supply sources or orientation during reassembly.
I have new replacements from All Ford.
the fronts were straightforward but, after partially destroying one of the rears and making zero progress I'm raising the white flag.
your tips and trick are greatly appreciated.
TIA