Correct answer
Winter-grade windscreen-washer fluid as specified by the manufacturer.
Use windscreen-washer fluid with freeze protection suitable for expected temperatures and compliant with the vehicle manual. Follow the specified dilution for concentrates; do not add water to ready-to-use fluid unless the manufacturer allows it. Engine coolant, descaler and household detergent are not equivalent substitutes.
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Winter-grade windscreen-washer fluid as specified by the manufacturer.
Household detergent as a universal substitute for washer fluid.
Engine coolant, regardless of the manual.
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