The directions are on the target so get them going in competition against each other. Recognize the best shooters. Post their targets on your bulletin board.
Most importantly get them the proper cleaning equipment for the 14. I would get Dewey Service Rifle rods with bore alignment guides. You have to impress on them that the cleaning rod cannot touch the muzzle. GI jointed rods have ruined more barrels than were ever shot out. Make up cleaning rod cases from 1 1/2" PVC water pipe cut about two inches longer than the rod. Cap one end and put on screw top clean out on other end. This will protect the rod from damage, dirt etc.
Do not use CLP ( I christened it "THE CLAP") Go to your motor pool and get some Mercon Dexron automatic transmission fluid. Next get Kerosene (K1 if they have it) and mineral spirits (paint thinner) and mix it 1/3rd of each .i.e. two quarts of everything will make 1.5 gallons.
Get some small tilt mouth plastic bottles and give each kid one.
This stuff is excellent bore cleaner and light lube. It will dissolve carbon.
Barrel life is dependent on cleaning. I have been running a study for last three years on three barrels. I have developed a system where the data indicates I can tripple the life of barrels by proper cleaning.
THE SECRET OF THIS IS CLEAN THE BARREL JUST AS SOON AS THE LAST SHOT IS FIRED before carbon cools and becomes hard.
The cleaning system I finalized on is right after the last shot I put on a 30 cal bronze brush and soak it down and make three or four passes in the barrel. Then I take of the 30 cal brush and put on a 22 cal brush and wrap a 30 cal patch around that. Soak it down and swab barrel. Remove patch and replace with new and dry it out. The 22 cal brush makes the best cleaning jag I ever used.
Wet another patch and run this through. It should come out clean. Dry the bore and the residue you can't dry will protect it.