Glass and digitizer replacement adhesive

I am in the middle of the replacement and just seperated the broken glass from the film that covers the actual color screen that is under it. That film has a milky color to it and I can't find anyone tutuorial that says what to do or how to remove that adhesive that remains which seems to be a lot. First, what is the film that has this remaining adhesive on it part of the touchscreen digitizer? What steps are there to either clean the adhesive off or somehow reuse it on the replacement glass?

Dan