While Magic Erasers effectively remove various stains, including crayon marks, they can also be quite abrasive. Before using a Magic Eraser on a plastic toy, it's essential to proceed with caution. Test the Magic Eraser on a small, hidden area first to ensure it doesn't damage the toy's finish or cause unintended fading. If the test area is unaffected, you can cautiously use the Magic Eraser on the crayon marks, applying gentle pressure and avoiding excessive scrubbing.