[Nutrox]

 
If you ever need to remove all of the movie clips on a timeline you could use the following function. Keep in mind that this will only remove movie clips that have been added using attachMovie, createEmptyMovieClip, or duplicateMovieClip.

function removeChildren(parent:MovieClip):Void {
    var i:String;
    for (i in parent) {
        if (parent[i].removeMovieClip) {
            parent[i].removeMovieClip();
        }
    }
}
 
// Delete all of the movie clips in myMovieClip.
removeChildren(myMovieClip); 

Instead of using typeof to check if the object is a movie clip I am simply checking if the removeMovieClip method is available in the object. This should be quicker than using typeof.