just go to a gas station, pay $3.19 for a gallon of washer fluid.
its perfectly fine for your car, your windows, your metal, your windshield.
obviously dont drink it, dont feed it to your kids, and dont feed it to your dog.
you know what else is poisonous? motor oil. coolant. too much salt. too much water. laundry detergent. too much alcohol. going out camping and getting bit by an infected tick. going out camping and drinking parasite infested waters.