Yeah, the first rack took probably 15 minutes to clean up, but i did much better on the second one. I found that it was easiest to slide a paring knife in at each rib from the end to separate the membrane there and then work my way between the ribs. I was able to pull a good section (2 inches or so) of the membrane from the long end that way and then i worked my way across the flat section and up along the curve last. The second rack only took about 5 minutes and looked much better than my first hack at it.
I peeked at the ribs a little bit ago and they look fantastic, my only worry is that they're going to finish too early. Thinking about foiling them in a cooler for a couple of hours then returning them to the grill to sauce and finish them up.