I do a 5m soak in starsan solution with the posts/poppets every time. Dip tubes just get hosed out. If you drink IPAs, you can get some gunk up in there that can cause you some distress.
Get the tool below at Sears (I got it off the shelf, not online). It fits on both size posts, makes quick work of them. I keep it in my kegging bin (with all the extra seals). Oh yea, if you have older kegs, replace the small oring that goes on the dip tube. They really get compressed, and permantly. I just replaced all of mine when I realized I wasn't getting a good seal from one of them. They were ALL in bad shape. I keep extra seals and poppets - they are cheap. Keg lube is great also when you have a hard time getting disconnects on posts.
One more thing, while we are discussing this: the liquid disconnect should be opened and cleaned out occasionally. I think a lot of brewers don't realize that they can take a screwdriver (or a dime) to the slot on the back and open it up. There's a poppet in there and a lot of area for nastiness to collect.
Craftsman 11/16 x 7/8 in. Wrench, Ratcheting Box-End
| Sears Item# 00942165000 | Model# 42165
http://www.sears.com/craftsman-11-16...p-00942165000P