[Please advise: removing word ballons from comic art]

I've tried the clone stamp before and can't see to get it right.

Is there another technique I could use? Or could someone maybe do the modifications for me and then let me know how they were done?

[Please advise: removing word ballons from comic art]

One of my hobbies is using interior comic book art for backgrounds and blogging, but I sometimes want to display images without the word balloons.

I've tried to do this myself, with usually poor results.

Here's an image I'm currently trying to "clean up:"