Apply a suction handle to the rear glass, as close to the bottom edge as possible.

If your rear glass is badly cracked, covering it with a layer of clear packing tape may allow the suction handle to adhere. Alternatively, very strong tape may be used instead of the suction handle. If all else fails, you can superglue the suction handle to the broken rear glass.

Pull up on the suction handle with strong, steady force to create a gap between the glass and the frame.

If you have trouble creating a gap, apply more heat to further soften the adhesive.

Insert an opening pick into the gap.