I'm sure this method has been used by others and this suggestion may go better in the Paint and Body Section. I just want to catch a lot of eyes with my suggestion. If you have a Heat Gun then give it a try on that black tar stuff that's stuck to the floor pans and other places. I can't get dry ice very easy and it's Sunday night to boot. I got my Wagner Heat Gun out and it worked really great at helping me remove that black tar coating in the passenger side floor pan area, etc . Heat gun, good lighting, couple of scrapers / putty knives and I had a big area clean in short order. Got me some cleaning to go but it got the majority of that hard tar removed. As a added bonus the gun keeps things warm and it's cool out tonight. Gun was cheap plus you can use it all around the house or car and the work area stayed dry. Hey it was a win, win!!! Hope this helps others with their Z car.

How long did it take you to get all the tar off your hands, arms and face ? I tried that method and got about halfway before I threw in the towel, what a mess. Kudos to you for sticking to it, I ended up doing the rest of the car with an old wood chisel and a hammer.

Lucky me I did not get much on my hands, arms etc. I just eased along with the gun and did not get the tar stuff too hot and gooey. Got a little on my hands but my hands stay stained up most time anyway from car or motorcycles work.......;)