Well, I got a dremel, and they are very handy, and using a dremel to get in them grooves and crooks and crannies, I think its a good idea, and I don't think its unethical at all, in fact, I think that using the word "unethical" is improperly characterizing the whole thing. If I read it correctly, Mark is only talking about getting out junk that has accumulated over time and wasn't there to start with.
So I say go for it. And if a piece is rough, and I want to smooth it out, I'll use sandpaper on it, and then some good emery cloth, and it looks better. I don't see anything wrong with that.