1994 Volkswagen Jetta WindShield wiper problems

1994 Volkswagen Jetta 4 cyl Two Wheel Drive Manual
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My wipers only work at one speed(fast), a problem that I,ve had for a while. Also when I turn them off they do not go back to the bottom. I have recently failed inspection because of this and I was curious if you guys had any idea what would cause this problem.
Thank you,