I am changing th rear wiper blade. I am unable to reomve the old one at preent. I see the retaining clip on the existing blade. I have tried pushing it in & out but neither releases the blade. I expect that i am not pushing hard enough, but do not want to push too hard for fear of breaking the wiper arm. Does any one know which way to push it or whether the blade is released in sonme other fashion?

Many thanks

maheal