A couple of weeks ago there was some comment on the need for a Rear Screen Wiper. You might like to try " RAIN-X ". Not quite as good as a wiper but does help.

A friend recommended it to me and then gave me a bottle. I imagine you can get it from Halfords and similar. On the Windscreen, in moderate to heavy rain and speeds above 35 mph, it keeps the screen completely clear ! Not quite so good in very light rain or roadspray.

On an other topic - Top Gear, I swapped my 1999 Mercedes E-class estate for a Superb Elegance. The Merc. was the worst car I have owned in 50 years of motoring. Total breakdown 7 times in one year. The Superb is superb !!

I find that by simply polishing your windows regularly this has the same effect.

I agree just not every time.it can build up