The S&W M&Ps were in surprisingly good shape. I'd estimate that Heather has 1500+ rounds through hers since the last cleaning, and I have probably 750+. There wasn't much carbon build up at all, and what little there was cleaned right up. The barrels were good after one wet patch, some light scrubbing, one more wet patch, and about three dry patches. The slides and other surfaces pretty much wiped down. I was impressed. We've been shooting a mix of cheaper American target ammo (Federal and the like) as well as a few mags of carry ammo (to rotate our supply), so nothing unusual.
My AR also got a cleaning. I'd wager it has probably close to a thousand rounds through it. There was a ton of carbon build up on the bolt; it was filthy. Still, I've cleaned a lot of AR-type platforms so it was a pretty quick process.
Of note, none of these firearms have had any sorts of malfunctions despite being run for quite awhile without being cleaned. The M&Ps continue to impress with their reliability (although the triggers are as mushy as ever!). The AR was also running like a champ -- the BCM upper and LMT bolt carrier group seem to have been worth the premium for quality gear.
I've also switched over to CLP. In the past I'd been using a mix of Hoppes and other gun oils/lubes/greases/etc. With the move, I pitched all of my other random oils/lubes so I just bought a big jug of CLP for use on everything. Its simple, its cheap, it works in all temperatures, and I've had good experience with it in the past, so why not go with a proven champ? I eventually want to try out the Miltech I got from Linoge's contest but that is heat activated so I want to put it on right before shooting at the range. I figure in the meantime CLP should be effective at stripping the old gunk as well as lubricating as needed.