One damp with dish soap Dawn advance 3x. I squirt a quite few drops of soap in a hot bucket of water, soak fiber cloth and get it lathered up with soap. Squeeze fiber cloth damp and start washing your windshield. You might have to repeat a few times depending how bad that film of dirt is.
With a new fiber cloth wipe off all the soap off until dry. I find in the sun and/or the fan on will help with the drying.
Do wear gloves or have hand moisturizer on hand because this will dry out you hands. Use dawn and not other soap as they will have moisturizer stuff in them leaving another film behind.
You can wash your dash but wash it after the windshield and or windows inside using the same technique. The soap solution will destroy COVID-19. Well any soap will destroy COVID.
Where do I get my supplies from... Costco
This Dawn will leave a fresh scent behind so if you don't like the scent... don't use it or rinse with water.
View my fuel log 2015 Micra SV automatic: 10.0 L/100 km ... 28.4 mpg (Imp) ... 10.0 km/L ... 23.6 mpg (US) ...