West Peterson wrote:
Tom
You may find that the windshield wipers will work like new merely by cleaning the linkage joints and applying new lubrication. I'm not familiar with the electric motors, but there may be some lubrication needed there as well.

When I worked on my non-moving wipers (vacuum), the linkage joints were stiff with old, old greese. It was difficult to move them even by hand. Now they move back and forth like a banshee.