Markers on walls? The Pink Stuff to the rescue ... You want to soak up/clean up as much as you can, kinda pat dry, then spray a good amount. I like to let it set for a while, put down some carpet ...

This set comes with one tile lines brush ... and scuff marks on sinks, crayons on walls, Sharpie on binder, a ring around the door knob from greasy mechanic hands on my new unpainted white door, and ...