To Pre-Clean Eggs first rub by hand with a baking soda paste, then use the Mr Clean Eraser on any nasty spots, finally dip the egg into white vinegar, rinse with clear water and dry. Dyes take brilliantly this way.
As they are used more over time, the Mr Clean Magic Eraser will naturally break down, telling you it is time to use a new piece.
Caution must be used around pets or children, you do not want them to accidentally ingest pieces of the sponge-like eraser!