Best make for cleaning Windscreens

[clancy]

Tried a few different ones, don't like most as the wipers either squeak or do nothing at all as they pass over

but the auto glym glass polish seems to work very well

[Pinky 1959]

I use Rain Racer on my windows on the cars , I also use it on all the house windows as well and only have to clean them properly once or twice a year as the rain washes all the crap off them .
For Juddering wipers try wiping the rubber with the window cleaner that you use on the windows .