first of all scratch out the top layer of the tint from the window,the black residue layer would be left behind which has stuck onto the window.
now do the following:
1- park the car,open hood,open brake oil cover.
2- take a small clean cloth and dip in the brake oil.(oil would be a little hot)
3- rub the oil drenched cloth on the tint paper and leave for 10mins.
4- take a small new blade,and try to slide out the excess tint paper(nothing happens to the glass for godsakes!!)
5-when done,wipe the window with a clean lint free cloth.
hardly takes 5mins on a side window.back screen takes more.