I bought these a few weeks ago. I had done a project with the boy for Clint’s birthday present. I guess I forgot to put one of them away. The black one. Jack found it and drew all over the refrigerator door! I immediatly thought, “Uh oh…that’s never going to come out!” So to the phone I went, to call my mother-in-law. She has 5 children so surely she’s been through this before! She suggested Goof-Off and I asked if perhaps Nail Polish Remover would work. I tired it and BAM! The marker came off! Not without a fight, though. It took almost a whole bottle of remover and about 6 paper towels to get the surface white again, but at least it’s off!!