Maybe your screen is the fault
Something that may be not considered here, do you use one of those £5 car washes manned by Eastern European folk?
They use a wax to make the paint work look good, on the screen it’s a nightmare.
Asked me how I know
50 sovs for replacing wipers.......insane.Audi's recommendation is that wipers are chenged every 6 months, we charge €50 but that does include fitting by an Audi technician