Hello, what effect should I expect with screen dirt? Till now I have not experienced anything what could be like a getting dirt screen, windshild, visor. Maybe I misunderstood something but for me, a dirt screen is like in NR2003 Racing with a cool feature of a getting dirt screen (and the friendly pit crew who cleaned it while pit stop)
Hehe now when you mentioned it then I can remember that a winning position was taken away from me in an NR2003/GTP online league race years ago. It was in the US based FSB Racing where we were racing on one of the SPA layouts. I was leading but suddenly the windscreen on my Sauber GTP began to be so dirty of both some backmarkers oil and dirt from the track. I tried to stay out from pitting because I wanted to win ofcourse But the screen became so dirty that I crashed the car Afterwards I asked the other guys how they managed to see through the dirt. Haha they said they all used a small adon called clean screen or something - that did set the dirt OFF.
Try racing the Group A's around Bathurst 1983 for long enough after 4pm... You'll notice a dirt layer build up...