Prius Liftback (Lines on Window)

When rear windows are tinted the installers often need to do it in strips: the curvature is too great to just use a single piece. They overlap the strips slightly, about 1/8", and coincide the overlap with the heater wires to make it less obvious. Maybe that's what you're seeing? It definitely can't be removed.

 

Usually small overlaps. I've watched them doing a rear window: they wet the outside, lay rough-cut, slightly oversized strips, then trim them while they lay on the glass, with scalpels/razors, cutting through both layers at the overlap. Then they transfer the strips to the inside, taking care to overlap them slightly. It's an art, for sure.

I'm not a fan of tint now; would not want it. But I've got it in the past, and did a few side windows myself. But left the tricky rears to those pros.