Ratters during decoupling TDCI

Hello together, I am since the middle of November ́03 proud owner of a Focus FUTURA 1.8l TDCI 115 hp. EZ.10.02. 4-door of course!!! I have a few minor problems however. And that is: 1. Rattert the engine when I step the clutch. The Ford workshop told me this is normal, that is a DIESEL. The rattert so when you step the clutch. 2. It is a way to knock more to hear noise when I am at 120 km/h on the highway. 3. My windscreen wash nozzles adjust to the driving. I set them yesterday evening, this morning the windows were washed, everything was fine. On the highway the windows were washed again, then the beam almost went over the car again. Ford means that can’t be. If the nozzles at the stand (show) do not adjust what they did not, then that can’t happen after a ride. The master did not say it directly, but so it came over, that he did me for crazy driving. 4) Is a problem where I may already know the cause. Since the question is whether and how I can fix it myself. And indeed my blower runs restless. Ford believes there is a leaf leaf in the pollen filter. But if so, then this would not be a guarantee, so Ford advised me to wait until the next inspection, then the pollen filter will be renewed anyway. But that will take another year. Don’t I come to it myself? were so my problems with my new car. Can one of you help me? Ford feels obviously overwhelmed with these issues except for the ventilation. Please help me, I would like to enjoy my car again!!!