to put this complaint to bed, having a spoiler that allows airflow to go over the window is a no no really as rain will get on window much easier than splashback from the rear, so there should of 100% been a wiper.
But really I thought everyone put rain x ceramic, or a ceramic coating on front and rear window, I have for years and hardly ever use wipers on anything over 45, I only reach for the wiper stalk when its really heavy.
