The pair of new Anco blades i put on our Merc. Grand Marquis seemed to smear or leave a film on the windshied if it was raining or dry!
I changed the wiper fluid and cleaned the windshield and the smear was still there.
I bought one new Bosch 'marathon' blade and it wiped clean, wiped off the smear and did not smear.
Now we have two of the Bosch on the car! They are $14 plus ea at Walmart!