I haven't seen it for ages but Lidl used to offer among their superb range bottle of 1:100 screen wash additive, no not their equally superb screenwash anti freeze.
If you added a capful to the washer bottle it would keep that greasy smearing to a minimum, but i aslo used to wash the screen and wiper blades with a mix of after using wash and wax shampoo, again it left a squeaky clean screen.
Also haven't seen Holts (i think it was) Mixra for ages, that was specifically designed for squirting on the screen to shift the greasy stuff and insect squash, it worked very well so sods law any thing that does work vanishes.
Anyway, i make sure to use something decent to wash the screen, and most importantly, the blades, after normal car washing.
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