removing instanced movie clips

I am trying to clean up all the 'instanced' bad guys that are created during game play. Im having some problems though! I can get them to reset, but they keep coming back anyway!

this is the code i use to create them..

function initEnemy() {
for (i; i<enemys; i++) {
attachMovie("res", "enemy"+i, i*100);
//create new enemys for each loop
trace("made res");
enemy = _root["enemy"+i];
updateEnemy(enemy);
enemy.onEnterFrame = function() {
for (var j = 0; j<10; j++) {
if (this.hitTest(eval("_root.bullet"+j))) {
score += 100;
updateEnemy(this);
unloadMovie(eval("_root.bullet"+j));
enemyDie(eval("_root.bullet"+j)._x, eval("_root.bullet"+j)._y);
}
}
if (this._x>0) {
this._x -= this.velo;
} else {
updateEnemy(this);
}
};
}
}
initEnemy();
function updateEnemy(which) {
which.gotoAndStop(random(5));
which._x = random(100)+530;
which._y = random(60)+120;
which.velo = random(6)+2;
}

and this is the code i use to destroy them all:

function clearStage() {

gotoAndStop(122);
trace("trying to clean");
var enemys = 0;
for (j=0; j<100; j++) {
updateEnemy(_root["enemy"+j]);
removeMovieClip(eval("_root.bullet"+j));
//remove bullets and enemys
}
}

thanks so much!