Clio III/Problems with the windscreen wipers

With our Clio III (EZ 07/10, KM-Stand currently 4,000) there are again problems with the windshield wipers. Shortly after the handover I noticed that the wipers caused noises and have already drawn shrieks. Since this is also a considerable safety risk, I immediately claimed that. The dealer also showed himself very kulant and has mounted new wiper blades free of charge. In the short term the wiper result was also satisfactory. After now 4 weeks there are already clear shrieks to see. Above all the upward movement of the wiper leads to streak formation. The volume has become better but it can not be that the wiper is shed so quickly. I always take care that the in the summer by no means about insect remains, which are on the windshield but waits for a time before I turn on the wipers, so that the disk is also properly wet. Have I handled so so far with all my vehicles and had during the last years with various vehicles, which were already equipped with the current Aero-Wish ones?