Depending on how the graphic has been added you might be able to get them off with a very hot iron on the printed side, but this might just end up making them loop terrible...
I removed the graphics from my vintage star wars shirt through years of wear and drying it in the dryer with the graphics facing out. I was told later that if I had turned it inside out to dry it the logo would have lasted longer.
To answer your post, I think it would be very tough to remove the graphics from any shirt without making the shirt look horrible.