I've had the same problem when I don't wet the windows enough. What's more, I always give the area where the squeegee crosses a little tap. Since then it's been great.

J'en a fait l'expérience quand le verre n'est pas assez mouillé, de plus, je donne toujours un petit coup de patte final sur l'endroit où la raclette se croise.

I think it's great. Make the glass really wet so there are no streaks.