remove selected properties from ShapeLayer

This seems so simple, but I cannot figure this out.

I have selected Stroke and Fill under ShapeLayer. And I want to remove them from this layer.

    var myLayer = myComp.selectedLayers[0];

    var propertyCollection = myLayer.selectedProperties;

    for (var j = propertyCollection.length-1; j >= 0; j --) {

        propertyCollection[j].remove()

    }

However, on second iteration AE gives me error "Object is invalid". Am I missing something?

P.S. How do I paste code here so it looks like a code, and not a text?