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you can try to remove as much as possible, but half a pint of washer fluid would not cause any damage to the cooling system. if you have a wet and dry vacuum that would be idea to get it out so you wont get any in your mouth. most windshield washer formulas are mostly water anyway so in the event you have some left in the coolant bottle it will be diluted by the couple of gallons of engine coolant that is present. So rest easy, your new Camry will be just fine