Are you sure you are not just parked in a '70's drive in movie theatre ?
Dont laugh at this but I used to drive from one end of the country to the other and horrible conditions and when the windscreen would get greasy like you describe ( caused by road grime)
The only solution was, when it was drizzling, go get a bottle of Coke ( Coca-cola ) turn off the wipers and empty about half the bottle on the windscreen letting it pour from the top and flowing down. Give it a few seconds and put the wipers going. Repeat the process with the second half of the coke... Now this will make you paint look dirty but it will wash off. Trust me on this.. I laughed when I was told about this trick at first. Now I do it regularly.. Like a new windscreen after treatment
Have you been having car washed in automatic machine at garage? if you get the wash and wax, it will leave a film on the windscreen. Best bet is to wash windscreen and wiper blades with sponge and proper car wash solution. Until you do this there is no point in adding anything to washer bottle asit will only give you temporary relief
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