BMW Tech Tip: Windshield Washer Jets Spray Little To No Fluid
If the window washer fluid jets spray a very low volume of fluid or no fluid at all, there are three possible causes.

Kia Tech Tip: Poor Windshield Washer Performance
Possible foreign debris can accumulate on the windshield washer pump inlet filter and cause a weak spray. Over time, this can cause some Kia vehicles to exhibit a limited application of windshield washer fluid when the washer function is used.
