Carefully.............seriously put something like a pillow on the glass in case the arm snaps back and cracks the screen when you have removed the blade,
Thanks for the tips chaps. I'm struggling to work out how to undo the clip that holds the blades in. I've had a look on YouTube and cant find anything helpful.
Possibly as any other Bosch wiper blade that accepts hook style of wiper arm with the supplied universal adaptor.
Lift the arm fully off the screen and with the blade 90 degrees to the arm pull the blade back slightly back down the arm 1/2 inch or so to release the hook from the adaptor, force is some times require for various reasons.
I've spent ages trying to get old blades off over the years. I learnt the quickest way is to break the plastic tag/clip off with a screwdriver, only takes a couple of seconds.