private void cleanEntities() {
		for (GameEntity ent : entities) {
			if (ent instanceof Mine || ent instanceof PlasmaBall || ent instanceof PowerBar || ent instanceof Missile) {
				if (ent.isDestroyed()) {
					Log.e(TAG, "I'm about to CLEAN: " + ent);
					removeEntity(ent);
					if (ent instanceof Observer)
						removeObserverAll((Observer)ent);
				}
			}
		}
	}