It is a classic sleeper of a cam - titanium shutter with 1/8000th, and some of the best AF and metering Nikon's ever done.
I too have done the alcohol thing. There are some thicker areas still visible, but they're not sticky anymore.
One thing I found sped it all up: use 99% alcohol (many of us have that for cleaning), and cut some strips of plastic food wrap. Dribble the alcohol on, and then lay the plastic over - this keeps the alcohol from evaporating. Let it soak in for 10 minutes or so, rub & repeat. Speeds up the process for sure.