Even though the 944 gives me some headache currently, I spend time today to make it at least look good again. When I polished the old paint the first time, I didn't seal the surface afterwards, no wax, no sealant at all. So the dirt had a nice open surface to creap into it. It looked really terrible after a while, but today I washed, clayed, polished and waxed the paint, now it is all good again: