camgfs:Nice Pipe!Honestly, since it's been used, I'd use alcohol or something to clean the mouth piece and then rinse well until there is no alcohol taste. Last thing you need is whatever made the previous owner sick enough to give it up :P
YankeeMan:Nice pipe! I just use a damp cloth on my collection. Don't use anything chemical or abrasive, obviously.
From what I can see in the photo, it seems to already have a good buildup inside. I'd just give it a good scrape and you're good to go.