What, if anything, do you do to lubricate your track (mine is from PVC) when exposed to the elements? I quickly found that WD40 or Pledge attracts soil and dirt when there is wind. Is it better to use nothing at all in these cases? Or maybe I should lubricate the wheels instead?

use teflon based lubricant. it is dry and do not keep dust.

Sounds great! Where do you find it? Any common brands?