shooting water in there is going to wreak havoc on your throwout bearing. and rust setting on your pilot bearing, and clutch pressure plate and flywheel when sitting. you will have too many problems by doing this. just pull the trans, clean the stuff out, and make sure you put a boot on the clutch fork.
i do have the fork boot on . but we play in 2 to 4 foot of mud and water . and with all yota in a zuki theres not alot of room to pull the tranny so i pull the motor .and to be clear on the clutch i run a 1600 ceramic .