Next time, use your scraper and brush to clear the windshield, NOT the wipers.
Raise the hood. Remove the wiper arms. If the plastic cowl trim is assembled in two pieces (some models are) you will only have to remove the left (driver side) wiper arm. Remove the rubber cowl seal, then the screws and/or push pin fasteners holding the cowl cover. Remove the cowl trim/cover. You should then be able to see the wiper motor cover:
Remove the push pin fastener holding the cover, then remove the cover. This should reveal the wiper motor, linkage, and plastic wiper stop cam cover:
Lift off the black plastic stop cam cover to reveal the stop mechanism and cam. You will probably see the metal stop tab in a condition similar to that pointed out by the arrow:
Closer inspection should reveal something like this (the blue piece is the stop tab):
Using chain nosed pliers (most people errantly call them "needle-nosed", but true needle nosed pliers are actually quite different) straighten the stop tab so that it is perpendicular to the wiper cam:
Make sure the area is clear of obstructions, turn on the ignition, and operate the wiper motor and allow it to park while observing the mechanism. Once the wiper motor reverses to park the wipers, you'll see the action of the cam and stop tab. If you bent the tab too far, it will probably clear itself when the motor begins to run. If the motor parks and stops correctly, apply some lubricant (white lithium grease) to the cam and mechanism and test them again.
Install the plastic cover, and reassemble the motor cover, cowl cover, and wiper arm. Remember to install the rubber cowl seal.
Lastly, find your ice scraper and snow brush, or acquire new ones. Instruct all the drivers of the vehicle to use them, or start saving your money for parts. The tab can be bent and straightened two or three times before it finally breaks off, which will involve a lot more repair work.