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That's the remains of Ivy that's been removed. Its not your problem. The roots if Ivy impregnate themselves into the plastic. The frames are damaged.
You might be able to remove them with abrasive means, but you run the risk of removing the outer polished layer of the frame.
Don't get involved is my advice. We have cleaned some windows for the past 10 years that had Ivy growing on them and then removed. The roots are still there.