My washer jets operate the same, so imagine it's the way they are designed.
As for smears on the screen, give the window a damned good clean lol, use an off the shelf cleaner OR make your own - In a trigger spray bottle put an inch of white vinegar in the bottom, add three drops of washing up liquid and top up with cold water.Put the top back on, give it a gentle shake and spray and scrub with a plastic pan scourer before rinsing with the washer jets or clean water.