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The window sprayers are most likely frozen. Most repair shops either don't use anti-freeze in their window washer fluid, or the fluid sits in the reservoir long enough for the antifreeze additive to evaporate out.
The headlight nozzles don't have to travel as far through cold fluid lines so they aren't freezing up.
The only real solution will be to replace the washer fluid in the reservoir with one that contains an antifreeze or de-icer agent. That doesn't help much in the short term. The lines will have to thaw before you can pump any fluid through them and push out the fluid that is freezing. You might try pouring hot water on the spray nozzles; sometimes just the nozzle is frozen and once it is thawed you can get the fluid flowing again.
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