How to remove an object from Leaflet?

Question

JavaScript

With the addition of an object to Leaflet, everything is clear:

L.imageOverlay(fullURL, xbounds).addTo(Window.map);

But what needs to be transferred to remove it?
The documentation says:
removeLayer( <ILayer> layer )
But if I add a raster layer as indicated above (url, borders), then how can I find out its id or get its object (because you can somehow delete it by object)?