^ Ceramic nanoparticles, allegedly. Are you doing the bile green rotary, or the atrocious Datsun shitbox-deathtrap ?
A lot about clean screens depends on whether you have been parking under trees, and what type. Certain ones give off a fine spray of sap which can be difficult to get off, and others give off sap which comes off easily with a quick windscreen wash if you have detergent in the washer bottle.
I use Rainex and as it is dissolved in alcohol, even after cleaning it well prior to application, the application cloth still picks up dirt.