Just a thought on first impressions, items for sale....and your thoughts.

Yes, it irks me too. Why not take the five minutes to dust, wipe and accurately light the item for sale. Gives you a little more room to haggle if someone makes a low offer. Certainly cannot hurt.

A good dusting and a little Windex will pay dividends when selling anything. It is also a good idea to take a lot of pictures that show as much of the item's condition as possible, both the good and the bad. Visual proof is a great hedge against after sale squawking. 🦆  

When it comes to surface dust, a swiffer will do wonders. For aged-on greasy stuff, it's better to let sleeping dogs lie. "a little windex" might very well remove silk-screened lettering on age old faceplates. Been there done that. 

Agree with all that's been said. What's worse is when the add says something like "Finish on the speakers is a little faded, nothing that a bit of wax won't fix".

The why didn't he do it?