Removing multiple attached clips

Hi, can someone help me out with this problem please?

I’m creating a 5 part game, im using the slider from the button library to navigate between each part.

on part 5 I have actionscript attaching balloons in random positions on the stage and as they float across the screen the player has to burst them.

the problem that I am having is that if the player decides that they dont what to complete part 5 and uses the slider half way through to navigate to another part the balloons still stay attached to the stage in there last position.

I’ve tried several different ways but still cant get the balloons to be removed if the player navigates to a different part after starting part 5.

can anyone help me out with this??