I have always wondered also that "should clean up nicely". When I sell things, I try to put them in the best shape possible. A little elbow grease can make the bids go higher, and if you get a $10 higher selling price, for 10 minutes rubbing and cleaning, that means you are being paid $60 an hour for cleaning. That's more than what I make as an engineer!!!!
"Should clean up nicely", if you read between the lines, doesn't mean "I'm too lazy to do it myself". On the contrary, those peoples are very smart. It means :"the part is pitted. when you discover it's real shape, I will come out with "I thought it should clean up, I'm not a pro". Furthermore, it all depends in how high your standards are. For me it's a good looking part. That's why I said "should", because I was not positive".
Raul