Palitan mo na lang ang tint ng 1-2 shades lighter yung driver and passenger side windows. Pangit sir. I did that with one of my rides nagsisi lang ako. Ended up doing what i should have done in the first place, which was to replace the tint.
Pero if you insist, plastic plate at box cutter lang katapat nyan. Tape the plate to the window in 4 or more places, cut around in between the tape, then put tape where you have already cut (to prevent the plate from moving when you remove the first tapes), then remove the first tapes and cut where they were. Remove plate and peel off the tint. Remember to apply very light pressure when using the box cutter. Madali lang magasgas ang automotive glass.