Get some gun wipes -- Wal Mart has Rem Oil wipes; there are also Birchwood-Casey and Bullfrog brand wipes.
Just go over anything someone might have touched with the thing before putting it away -- sweat causes rust. Then run the thing through the barrel with a cleaning rod a couple times, and swab out the inside of the action. If you use Rem Oil wipes, that will keep it lubed, too.
Every once in a while, do a complete cleaning.
The gun wipe method works fine after skeet, or even hunting if it's not too dirty. What's cool is that you can do it right away, which matters more than doing it perfectly a day later, if it has sweat all over it.