The colour and smell tends to give it away. Unless the washer fluid had only been filled with water the last few times, it will have an alcoholic type smell and possibly a colour tinge, whereas coolant has its own distinctive smell and colour from the antifreeze, usually like a sweet smell. If it's clear and odourless, it probably will be water which can only really come from the a/c.
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V60 D4 SE Lux MY15 Savile Grey. Gone but not forgotten.
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