So i own a hatchback. I did away with the stock spoiler to get a bit more downwards rear-visibility, and also deleted the wiper because a loner wiper never looks nice. Now i have water droplets forming on my rear glass, and even with 50mph they refuse to budge or run off, so clearly there’s a pocket of stagnant air there. Would a roof spoiler be able to create some turbulence or other air over the glass so it would blow clean?

(Shown here on a FR-S with/without roof spoiler, it looks as if it has some air movement against the glass?)

Here’s my car in question.