The old trick for that was to cut a potato in half and rub it on the glass. Fine as a get you home but not a lot of use when they first pack in.
Should I keep a spare potato in my car for occasions like this? Does my Mark 1 Jazz have a cubby for a spare potato?
Would a King Edward do, or more probably a Maris Wiper!
If you use a maris piper you end up with chips in windscreen...