How can I get this bloody streaking off my window?!

[Craig-o]

I'm a bit confused as to why it wont come off. I applied rain-x to the windscreen and was all swirl/mark free when buffed in, all's well so far. Then I also ran out of washer fluid, filled it up with screenwash and when parked outside the house put the washers on to get the new fluid to come through and squirt onto the windscreen. Again, all's well so far. Ever since though I've got streaks going round down my windscreen from top to bottom (where I imagine the screen wash has just run down the window and dried as the car wasn't driven anywhere at that time).

But I can't for the life of me get rid of them! I've washed the window, used Auto Glym glass cleaner, Auto Glym glass polish, combined leaving me with a really clean shiny windscreen, but the streaks remain!

Any ideas on how to get rid of them?