Add Rain Gutter to Aluminum Window Trim
Turning the wipers on with the window open will push all the water into the car. Most luxury cars (like BMW) have a slight groove in the upper window trim to catch any liquid that might be on the roof or windshield. The Model 3 window trim is nearly flush with the body panels. Perhaps this is by design for aerodynamics. However, it certainly makes using the wipers with the widows slightly open impossible.