Make in no case on the windshield. The manufacturer advertises probably with good properties when it rains, but the opposite is the case. The wiper then lubricate enormous. It forms a very thin film over the entire windshield. Also have new wiper mounted. No improvement. I suggest you really really apply it on the windscreen on it.
Since I did not want to throw away, I have applied it to the windows of the house and conservatory. Here it works flawlessly. The water runs off. Even at a real glass shower enclosure properly.
