I just recently removed my old tint, which I've been dreading doing as I've removed some in the past. Getting the tint off was easy, but removing all the glue took forever.

I didn't use a heat gun or steamer, I left the car outside on a hot sunny day & that was all that was needed. All the tint peeled off easy with the adhesive layer still attached. The only spot that left any residue was along the defroster lines & on some of the dot matrix on the back windows, which was easily wiped off with varsol & a soft cloth.

Just make sure its really hot or the tint will peel off & leave the adhesive layer, which you don't want. You also want direct sun on the windows. I did this around 1 or 2 & the side opposite the sun wasn't hot enough. Parked the car the other direction, waited ~30min & it peeled off clean.