//Eraser style blur effect - NB. Clip must be centred top left.
var generations:int = 100;
var generationsCounter:int = 0;
 
function eraserEffect(clip):void {
	var bf:BlurFilter = new BlurFilter(2, 25, 1);
	var bmd1:BitmapData = new BitmapData(stage.stageWidth,stage.stageHeight,true,0x00CCCCCC);
	var bm1:Bitmap = new Bitmap(bmd1,"auto",true);
	var bmd2:BitmapData = new BitmapData(stage.stageWidth,stage.stageHeight,true,0x00CCCCCC);
	var bm2:Bitmap = new Bitmap(bmd1,"auto",true);
 
	var baseX = clip.x;
	var baseY = clip.y;
 
	bm1.x = bm2.x = baseX;
	bm1.y = bm2.y = baseY;
 
	bmd1.draw(clip);
	bmd2.draw(clip);
 
	addChild(bm1);
	addChild(bm2);
 
	stage.addEventListener(Event.ENTER_FRAME, blurThem);
 
	clip.visible = false;
 
	function blurThem(e:Event):void {
 
		bmd1.applyFilter(bmd1, bmd1.rect, new Point(0,0), bf);
		bmd2.applyFilter(bmd2, bmd2.rect, new Point(0,0), bf);
		bm1.x+=2;
		bm2.x-=2;
 
		generationsCounter++;
 
		if (generationsCounter>generations) {
			generationsCounter = 0;
			stage.removeEventListener(Event.ENTER_FRAME, blurThem);
			bmd1 = null;
			bmd2 = null;
			bm1.parent.removeChild(bm1);
			bm2.parent.removeChild(bm2);
		}
	}
}
 
eraserEffect(YourClipHere);