Correct answer
Winter windscreen-washer fluid with suitable freezing protection.
Use winter windscreen-washer fluid with freezing protection suitable for the expected temperature. Follow the vehicle and product instructions, including dilution if it is a concentrate. Do not use radiator antifreeze: it can damage paint and impair visibility.
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Engine-cooling-system antifreeze.
Winter windscreen-washer fluid with suitable freezing protection.
Water alone, because it never freezes in the reservoir.
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