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Releaseall, PB Blaster, WD 40, CLR, or all of the above, plus heat and tons of patience….. no hammering — you may break the bottom end of the crankshaft. For the not so stubborn instances, I’ve clamped vice grips on the shaft about 1/2 ” above where the shaft goes into the receiver and used a pry bar to lift it straight out. Be sure to put a reasonably thick steel plate against the bottom of the block.
The best way for the health of the motor is to disassemble the block and put the bare crankshaft and driveshaft in a pail of Kroil or Kerosene or Diesel for a month or more.
if you’re not going to disassemble the block and are letting releasing agents do the job, turn it upright and/or pistons down to clean out the solvents now and again before they dry and cause more problems, especially with the reeds.
While you’re waiting for the magical moment where the shaft slides out, order a driveshaft top seal and a spare to ensure water never intrudes again !