Congratulations, on your graduation! I recall recieving my first kilt as a graduation present, nine years ago. Bravo for getting started early!

Secondly, even with wool kilts, dry cleaning is a very bad option. The solution used will degrade the leather straps over time, but more importantly, the film left by that fluid will cause your kilt to soil more easily in the future- don't ask me exactly why, but that's what I've heard from several good sources. Wash your kilts in a bath tub or other basin large enough to accomodate a kilt; line dry. Don't bother with any special soap; shampoo, or my favorite, dish soap, will work just fine.

And always keep your hose clean too, lest you scare all of the ladies away!

Other than that, just follow the good advice provided by the gentlemen above me.