Rear windscreen heating question

I've noticed in recent weeks that the heating strips (not sure if that's the right term) have in some places stopped clearing the screen.

Is this something that can be remedied or will I need to look for a replacement screen? Only recently had the front windscreen replaced due to a crack via the insurance and don't really want have the rear replaced as well. Come to think of it, would the insurance even allow the screen to be replaced if the heating/de-misting strips stopped working?

btw, its a facelift K11 I'm talking about.
 
2 of my lines were broken last year, bought some from halfords and worked ever since, just mask of the line then brush it on leave it to dry and bobs your uncle :)
 
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