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Hello & Welcome to the Forums KParker
This is a common fault on some Megane & Scenic IIs, Usually if you recycle the ignition it will start the wiper working again for a short while.
I'm afraid it's a Renault only fix they have an update for this problem.
If you have no warranty left I would suggest you contact Renault Customer Services and ask for their input into resolving your problems on both your cars.