Is it normal for a pot with low hours,less than a yr.old to become dirty?
Normal, no. Possible, yes, especially if you use the pot specified in the instructions. Those pots are pretty cheap. Also the less you use it the worse it is, since you don't take advantage of the normal wiping action. If you live in a dry climate it seems to make things worse.
I am sure you can easily clean it, as others have pointed out, but this seems like an opportunity to get that nifty stepped attenuator you were thinking about!
