I changed my rear wiper blades recently, without any difficulties. I've now tried to change the front passenger side blade, but cannot remove the old wiper blade. There is a kind of tab that can be pushed (upwards), but it is still impossible to "slide" the blade out. I'm worried that if I use too much force, it will break. Should a lot of force really be required? Or am I doing something wrong? Changing the rear wiper did not involve any form of violence!