After cleaning you can use grease or anti-seize to promote easier removal the next time. First time can be a real bear!
I typically paint the flange area too, just to keep rust down a bit and less creep into the machined areas where it can do it's mischief.
Hence the grease recommendation, since even a thin layer of paint might make installing a little harder.
The spindle is a pretty tight fit into the knuckle, so it acts as both a lube and a rust reducer.
paul