Hello guys, I have also sealed the disc with my father (Audi A6), because I am very satisfied with it with my car. Now it comes now he has the following problem. Last time new windscreen wipers got and now the wipers only hop over the disc. Is in the rain the car no longer mobile. Now he was already in the workshop, they have changed the wiper blades bent after the stick etc. without success. Now the master of our family car house meant that this is due to the disc sealing, it should remove the sealing again, otherwise a new disc would be due. How or with what do I get the Ombrello removed again?