Messy stained marked on apartment walls

Ok, my great niece and nephew have made a coloring book out of their white walls- not good:( I need a quick fix to look like there was never a child in that room. Painting is not an option. These walls have crayons food markers ink ect on them. I need homemade go-to quick fixes to clean these walls. Help is needed asap so l came to all of you if there's a fix out there, l know you guys and gals will know what they are .
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