If I became principal of a school one of the first things I would do is call the janitors and custodians into my office and tell them that their jobs just got a whole lot easier.  If I were in charge no child would go out to recess until the lunch area is spotless.  If I saw trash on the yard, recess would hault until it was cleaned up.  IT'S THEIR MESS!  LET THEM CLEAN IT UP!  Continually messy bathroom would be locked up.  Students would wipe down tables, take out the trash and sort the recycling.  Let me tell you what would happen a few days after you institute this kind of clean up policy: the kids would stop making messes all over campus.  The trash would start to miraculously find it's way into the trash cans instead of under the lunch benches.  Bathrooms would be cleaner and the whole campus would look better.  Don't worry, the custodian will still have plenty to do but following the kids around cleaning up after them is not the best use of their time.

I would also harshly punish those student caught making the messes.  Any student caught messing up a bathroom would either have to clean the bathroom for a month or have to call their parents to have them take them home to use the bathroom.  Hmmm, I wonder if kids would think twice about defacing a bathroom if those were the punishments?

I would be even harsher on students caught graffiting the campus.  All over Los Angeles laws are being passed that allow the police to force the entire family of the tagger to clean up graffiti.  The only problem with this law is that it is so difficult to catch taggers since L.A. is so huge but schools are small, it's not that hard to catch taggers on a school campus.  I would love to see th tagger and his family cleaning up graffiti during school hours in plain view of all the other students.  Boy would that send a message!  Clean campuses are not that hard to achieve.

Here is what L.A. is doing:

http://latimesblogs.latimes.com/lanow/2008/08/graffiti-law-ta.html