Try ironing the underside, with the hat upside down and the crayon on the cloth. You could also try a stiff brush, and even some gentle sandpapering could work. These last two ideas I have used with success, by the way.
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Try ironing the underside, with the hat upside down and the crayon on the cloth. You could also try a stiff brush, and even some gentle sandpapering could work. These last two ideas I have used with success, by the way.