Rear wiper has a mind of its own

Ben85

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I'm guessing this will be the motor packing up with water getting in.

If it gets to the rear boot catch and plays the central locking up can I use the key and it'll stay locked?

Obviously I'll be fixing it. May dis connect it to start with.
Or just blank it off

What size plug would I need for the rear window and where could I get one from?