never had a smearing problem, sounds like you didn't buff it off enough after applying, or put to much on.
i use mine to clean the glass with as well as it strips all hte dirt out when you apply it. even on a washed windscreen the kitchen towel still comes out dirty.
persoanlly i do find it not the easiest product to apply. and am hoping the PIAA liquids will be better, as they have a screen cleaner, screen protector, and washer fluid additive to go with the wiper blades.
i've got a new wiper rubber form my drivers side as that one has worn out already after a year. just starting to smear slightly and not clear the window as well as when new. partly due to activating the wiper when the screen was frosty as put micro tears in the rubber.