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Meths works well, not a bad idea to add some to the washer bottle as well.

I usually get this 'grease'  following another car through the car wash, if they've splashed out for the super duper wash wax and blow dry

Swarfega hand cleaner. (For the windscreen, not for drinking.)

Leave it on overnight then wash off with warm soapy water. Works a treat.

White vinegar works good on both glass & wiper blades. It's alot cheaper too compared to all those 'flashy' cleaning products. When you given everything a good wipe over just a quick rinse & your away.

To be sure I would do all your windows.

Our dealer did the same to my car just before I collected it. It's the fault of the valeter who is probably some teenage kid from school working weekends who doesn't know any better & who hasn't been told not to wax the windows.