We Have never used polish ourselves, although many do. What we do is evry so often or when the pole gets gritty we extend the pole hose it down inside and outside flushing all the dirt out, works a treat and extends the life of the pole.
Most wear on the pole is due to trapped grit between the clamp and the pole, so cleaning this regularly will prevent excessive wear. This is the main reason that some peoples poles do not last as long.
The other reason for excessive wear is using a taller pole on downstairs, this causes the top of the top section to wear, because of the extra sideways pressure on the section in use on the downstairs, when actually on an upstairs pole it should be the bottom of the section that should wear out first.
We try to use a smaller pole for downstairs.
Alex