Sorry to bring up this old topic as I have similar issue as well.

By early this year, I changed my wiper to BOSCH Aerotwin Wiper Blade early this year and the screen is in perfect clean condition during raining except no repel water effect. Recently I used the Soft 99 Glass Stain Cleaner to polish the clean and windscreen, then following by applying Soft99 Glaco Ultra hope to improve the water repellent effect.

After that, by the next day, I realized that the wiper leave full of tiny haze like lines in both direction, but the lines disappeared in second. If at early morning cool weather, the lines could stay for few seconds before disappear. I'm not sure if this is what people called it as smearing. Don't think the lines are caused by my wiper as it's perfectly clean before this.

To test it further, I tried to remove the water repellent effect using Soft 99 Glass Stain Cleaner again, and using it to clean the wiper blade as well. Now the water repellent effect is gone, but the tiny lines effect still there. Worst case is now the running wiper leave some sort of 'white' mark on about 70% of the windscreen, seemed like due to oil or wax. This white mark will disappear in few seconds if I stopped the wiper from running. I tried to change my wiper back to the old one today, but seemed still the same, with temporary tiny lines and white oil mark.

I will try to use another windscreen polisher to clean the screen again this weekend to see if any help on it. Quite annoying especially with the white mark on screen, can't see it clearly during raining day.

Not sure if anyone of you have idea on how to solve it?