dude, this is what you do.
Step 1: use wide masking tape, and tape off any plastic or leather parts close to that window.
Step 2: Get a NEW single edge razor blade to help peel the edge of the tint film up. The yank the film off the window.
Step 3: Get a can of Brake Parts Cleaner, and spray a small area of the window. (start with a 6" x 6" square, till you get the hang of it).
Step 4: Take the NEW razor, and simply scrape the tint adhesive off. use a papertowel to clean the razor blade.
Step 5: repeat steps 3 & 4 till window is clean.
Step 6: spary some brake cleaner on a new paper towel, and wipe the window down to remove any missed spots.
Step 7: clean window with windex or other glass cleaner.
*NOTE: it is very important to have a fresh new razor blade, if you choose not to, you will be kicking yourself when an hour rolls by and your still not done the first window.