my_mc.filters = [];

Or to kill a specific kind of filter, you could set up an onComplete function like:

function removeFilterType($object:DisplayObject, $filterType:BitmapFilter):void {
var f:Array = $object.filters;
var a:Array = []; //remaining filters
for (var i:int = f.length – 1; i > -1; i–) {
if (!(f[i] is $filterType)) {
a.push(f[i]);
}
}
$object.filters = a;
}

and then in your tween, you’d do something like:

TweenFilterLite.to(my_mc, 1, {blurFilter:{blurX:20}, onComplete:removeFilterType, onCompleteParams:[my_mc, BlurFilter]});

(don’t forget to import the flash.filters.BlurFilter class)

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