In my case, I've noticed that when I wax the car, wax simply clogs the hole of the opening of the jet.

I just take a sewing needle or clothes pin and clean in out. Then I run the jets for good measure.

Your owners manual I think shows a picture of where the jets should hit the windshield.

I think the dealers use metal rods that they use to aim the jets, but with simple trial and error, you can aim them where they should go.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".