Will any amount of sanding or polishing remove these streaks? Is it
realistic to think more elbow grease might provide a 'perfect' finish
on the prop?

Maybe, but you have to question its worth. We have a polished prop on
Atlas, and gave up on improving it beyone the stage you are at.

What should I do to preserve the polished finish? Wax it - car wax?
The prop will be staying indoors out of the rain/elements, so I
probably do not need to put a $100/bottle coat of NASA approved wax.

We just hit it with Mother's Aluminum polish once or twice a month.
Since yours won't be spinning on the front of an O-540, I suspect you
won't have to do it quite so often...

;-)
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"