As a natural product, leather tends to burn during laser engraving or cutting; as well as producing a particular smell. The cutting edges may also turn dark and stain during the process. Many types of leather can easily be cleaned, but it is important to test the cleaning solution on a test piece. It is worth trying to remove the smoke residue with a dry cloth. Should any residue remain try cleaning the leather with a damp cloth or an alcohol-based cleaner.