That coating inside the cab comes off with a putty knife, aircraft stripper, and easy off oven cleaner! Watch out for the fumes off this combo. It's really tough to take! You have to apply and RUN. I have pics of it somewhere. Apply the stripper first, then spray the oven cleaner on. Mix it up with a cheap brush and leave the garage. Come back in an hour or so and scrape it off. I tried everything I could think of and this works! Do this at your own risk. Personally, I think its simpiler to replace the parts than try to remove this crap, but this is our first cat restoration! I had to try!