I say clean and check over. That allows for best visual presentation and also allows the seller to indicate mechanical condition. For example, I will never ever buy a set of hubs on-line unless I am sure that the rolling elements (cups, cones and ball bearings) are good.
So, for me, it is clean (sometimes polish if selling with pictures of on-line) and offer accurate information pertaining to mechanical condition. Now...
If selling on-line, which Campy Legnano hub set would you buy..?
Dirty and "as found"....
or all shined (machiine or hand polished) up and guaranteed mechanical sound..?
