So, Ill preface this with a short story.
Customer brought a car to me for Fuel line update. A process that includes the removal of the tank ... All went well & the car went back together & outside to get a bath prior to PU. After its wash hop in to move it, hit the wipers that creak to life, sweep .5 way across the windshield ...& stop.
So this is a cautionary tale to suggest if you've never serviced you Windshield wiper assembly, you might consider it.
Those of you in the warmer climes probably are less concerned but here in the PNW their function is pretty important, if you drive your car.
The design of the cowl lends itself to allowing water to get into the shafts & of course rust to follow.
Even rusted they may work ... albeit slowly. The motor laboring to grind the shafts in the bushed collars until... either the motor gives it up or they just seize.
Like this customer's car.
Motor is fine, the shafts rusted to the point they no longer will turn.