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1)
1/2 cup vinegar to 1 gallon of water (or 2 tablespoons per quart)
2)
1/2 cup sudsy ammonia to 1 gallon water (or 2 tablespoons per quart)
3)
1/2 cup sudsy ammonia 2 cups rubbing alcohol 1 teaspoon liquid dishwashing detergent 1 gallon water (This one is less likely to freeze in cold weather.)