If we were to say your washer fluid was 1/2 alcohol and 1/2 water then you would have a liquid weight of 118.8oz/gallon (water has a weight of 128oz/gallon). This would make each gallon weigh 7.425lbs.
Doing some 1am math, you removed 19.305 fluid ounces, which means you have a tiny ass washer fluid reservoir.
I don't even know what the fuck I'm talking about anymore