FORD 2009 Escape Hybrid v.1 - Manual (Page 47)

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.
2009 Escape Hybrid (ehv)
Owners Guide, 1st Printing
USA (fus)
Climate Controls
47