Do you mean the exterior?
I don't worry about their appearance too much - in fact I prefer tar stains and charred bowls on my Country Gentlemen - so I'm afraid I can't really relate to your concerns.
Stems are easily replaced, as are the pipes themselves, if you have a problem with them.
I clean them after every smoke with pipe cleaners dipped in alcohol. (Usually wait an hour or so for cooling)
I use alcohol soaked bristle cleaners for the shank until they come back somewhat clean, followed by a dry regular cleaner or two to absorb the moisture...
The stems get a couple alcohol soaked regular cleaners followed by a dry cleaner or two to absorb the moisture.
I usually rub a bit of alcohol on the outside of the stem to remove any residues. I used to soak them in alcohol until I noticed I had trouble with fitting the stems back in place... It's a shame because it exorcised most of the smell/taste that can linger after a normal cleaning.
Anyway, that's probably not what you wanted to hear but I don't worry about looks unless there's damage of some kind.