Good advice from all here I think...
IRL you'd just neutralize stick and push full rudder against the spin, or push the stick forward (although in the gliders I fly you might be at VNE before getting out of the spin if you did that). In the Hog, though, full throttle might actually help, IF the standard method doesn't work.
If you're still spinning helplessly towards the ground, rock the plane back and forth with the elevators, pop flaps and gear or whatever comes to mind. Just don't EVER try to stop the spin using ailerons. That only makes the spin worse, since the already stalled low wing will now create even more drag.
Rickenbacker