FORD 2011 Fusion Hybrid v.2 - Manual (Page 76)

Do not use razor blades or other sharp objects to clean the inside
of the rear window or to remove decals from the inside or the
rear window. This may cause damage to the heated grid lines and
will not be covered by your warranty.
Climate Controls
76
2011 Fusion Hybrid (hfv)
Owners Guide, 2nd Printing
USA (fus)