Our film does have a lifetime warranty against failures such as your film, but also against any other type of defects like discoloring, delaminating, or becoming hazy.
Removing the film on most cars will be an additional $125. The defroster is a problem, we cannot gaurantee that your defroster will work after the film is removed. The film most likely is sticking to the metal grid of the defroster, and when the film is removed it can break the grid in the process. While we take extreme care in removing the back film, sometimes its out of our control.
Hope that helps you, if not, please contact us for more information.
Feb 7, 2013