Crayola Bath Crayons Do The Bath Crayons Made Out Of Soap (crayola?) Stain?

Do the bath crayons made out of soap (crayola?) stain? - crayola bath crayons

I let my children are on the walls of the bathroom with Crayola crayons for the bathroom on time, but someone told me that the soap sticks are so light and requires no cleaning to remove. The voice of experience?