This might sound like a stupid question but how do you know when to stop filling the wiper fluid? At a quick glance I didn't see how it was possible to tell how much wiper fluid I was putting in my car so I decided to start filling. I was confused when I had almost used up half a bottle of wiper fluid and it wasn't nearing the nozzle, until I finally stopped and listened and heard exactly what the warning says. Don't overfill may cause spillage. All i heard was constant dripping and I looked under my car and I saw the orange wiper fluid leaking out of the underside of my car. It was nice of them to warn me about possible spillage but it didn't really stop me from overfilling it since I had no idea how much to put in. So is there a way to figure out how much to put it or is it just a guessing game?