Here's a video on the variety of uses a steam cleaner can be applied on. In the video you can see him removing tape residue off glass and he removes gum from concrete.
I know many of you guys use pressure washers to remove gum off concrete, but what's nice about the steam cleaner is that, it offers controlled pressure. So you can use this machine around pedestrian and not have to close off the street.
Its also nice for post construction clean up. It will remove paint overspray and adhesive residues.