It you put enough pressure inside, and if you do it fast enough, it's possible to crack the egg. After the contents have been expelled, I find it desirable to rinse the inside with water a couple of times. After that I stand the egg on end, on a paper towel, and let any residual water drain. I don't put any chlorine bleach or disinfectant in the egg and rinse it out though some who blow eggs do use such rinses. This photo shows the materials I use to remove the cuticle from the blow eggs.
Muratic acid is technical grade hydrochloric acid that can be purchased at building supply stores.
It is used for many purposes, including cleaning masonry after completion. Remove the lid, and it fumes. You may wish to use thin rubber gloves in your work. In the photo above, you can see an egg in the acid bath. It is foaming.