'Sort of' on topic, but...
I can't explain it but, when I had my Bora with rain sensors I thought they were pretty crap, never really worked when it rained and would occasionally wipe the screen in scorching sunlight! Had a cheap replacement windscreen at one point ('Smile' windscreens.... never heard of them and distorted view at edges of screen! Wouldn't recommend) due to insurance claim and still the rain sensors were rubbish..... Had the screen replaced again weeks before I sold the car by Autoglass and the sensors now worked a treat, always wiped whenever needed, I would reach for the stalk and just before I got there the wipers would whoosh across the screen. As I say.... Can't explain it, perhaps quality of the glass?? Perhaps the Autoglass fitter cleaned the sensor before replacement? Who knows??
Personally I find the Mk IV rain sensor pretty good, it *will* occasionally wipe the screen at odd times, but on the whole they're spot on.
