I have started using Crazy Art color pencils. I've not had any issues yet they wash out beautifully, however I've only used the light colored ones. A heck of lot cheaper then buying special named marking pens. My grandsons don't even miss them. When I had an issue with lead pencils I was told to use Dawn and scrub the lines gently with an old toothbrush let soak. That worked. You may want to try.