What should I do if the windscreen washers fail to deliver fluid while the wipers are operating?
Release the lever immediately if the washers fail to deliver screen wash solution, as dirt or ice may have blocked the jets. Releasing the lever will prevent the wipers from operating, avoiding the risk of visibility being impaired by dirt smearing across an unwashed windscreen. (Page 58)
From the official MG ZS Series manual, page 58
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