as usual, i found this idea online and thought it looked interesting enough to try....
Place an egg in a glass and cover with apple cider vinegar...(it's ok if a floats to the top and a little of the egg is exposed).
Let it set there for 18-24 hours. The shell may already have started to come off, or at this point you could run it under water and basically carefully rub off the shell. you are left with this!