Provide advice on how to accomplish the following goal. Give ONLY the advice, no other words or explanation.
For example:

Answer: <advice, as short as possible; a single sentence!>.

Goal: Clean an egg shell
Take a dull end of a butter knife and tap on the top of an egg shell over a small bowl, once cracked remove about 1/4 of the top the egg shell with your finger, empty egg contents into bowl, rinse the egg shell clean with warm water, sit on a piece of paper towel to dry for an hour
Gently rub the shell with a mild abrasive, then rinse under warm water.