So Me And My Roommate Got A Bright Idea To Make A Collage Of Drawings On Our Wall. We Want It Off! Help!?

We used crayola markers and then we saw that it looked terrible…we tryed getting it off with magic erasers…didnt work. Soap and water didnt work. Nothing worked. So we painted it purple thinking it will be better. Now we need to move out and paint it back to white..and what do ya know there is the UGLY marker drawings. They seeped through all that paint. Nothing works. HELP!