^ sarcasm ^
There should be two spring steel bars holding the rubber in place. Slide out the rubber and shake the housing a little bit and you should have your perfect material for picks (sawblades work too, but there's a lot of material to take away when all you've got is a dremel) fall right out.
Then again, there are some wipers that use a single piece of metal that is in the shape of:
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but smooth, this material is only good if you take out the valley and chop it in half (which is what happens when you take out the valley)