Domino cleanup has been split into multiple posts: Use these links to go straight to the portion of the process you are most interested in.
Introduction: Before and After pictures and what we will be doing.
https://engraveddominoes.com/domino-cleanup-and-restoration-introduction/
Deep Cleaning: How we clean them and what we use.
https://engraveddominoes.com/domino-cleanup-and-restoration-deep-cleaning/
Sanding: polishing or buffing any imperfections in the domino itself
https://engraveddominoes.com/domino-cleanup-and-restoration-sanding/
Painting: Restoring the color to the engraving
https://engraveddominoes.com/domino-cleanup-and-restoration-painting/