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They could be clogged by wax (did you wax the car lately?) In that case, use toothpick to clear the nozzles. Rub some dish detergent into the nozzles also helps since it can dissolve wax.
This happened to my lexus too. I just took a sewing pin and worked them over a little. I should have done a better job though because now one of them sprays too high on the windshield.
If you stick a pin or something narrow enough to go into the hole you can aim each individual hole. I used the vinegar and water approach to unclog mine. It worked great