I've gone to a lot of trouble cleaning all-the-way on both the flange and the final drive splines, and always found it pretty
clean and gooey on the next tire change.
The last couple of times I've gone for a less time consuming re-application of moly...
Some cleaning of the final drive splines, but heck, what I'm cleaning off is a lot like what I'm fixing to put back on.
all-the-way cleaning of the flange.
goo up the flange real well, and put it into the final drive and squish it in and out a few times. A little more on the final drive,
and few more squishes, and put it all back together. This procedure imparts what looks to me like good coverage on both
parts real quick and easy...
I've been running a pretty good final drive from Pinwall for the last 30,000 miles... It looks like this:

-Mike