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My windshield washer spray is lame! It only goes up 1/3 of the windshield.
Be warned, sprayers in the arm tend to freeze very easily.
Note I don't use a cleaner that's an antifreeze, don't need it here.
I suspect that may have been part or all of your problem. The antifreeze components discourage biological growth, which may well be what caused your blockage. The freezing temps may have degraded the biomass blocking your system. I would suggest you switch fluids. If I'm wrong, it won't hurt; if I'm right you may never have the problem again.