Rear Windscreen not de-misting
 

Checked the fuse of course..Any ideas?

What year car is it ?

We are seeing a lot of the pre facelift cars now with failing elements. They have a quickclear type screen with invisible lines which are almost transparent. The later cars have got the more traditional type screens with the black horizontal lines, and these seem far more robust.

If the fuse is fine, it might be a case of the rear screen simply being tired... There is nothing else really to go wrong....