removeeventlistener for addeventlistener and render2 listen

Question

Hi guys,

does anyone know is it necessary to remove listener for addeventlistener and render2.listen in Angular? I've always thought that after you leave a specific route, it's component is destroyed and the listeners are removed. Or this is not the case? Maybe they are only removed when they are attached to an element of the component and in case they are attached to global objects like document and window they are not removed?