Prepare the room you are working in by laying down a drop cloth. Open all the windows in the room so the fumes will be less bothersome. Adding ventilation can help prevent breathing problems. So if you have a fan, put one in the room. It should be blowing toward the windows so it blows the fumes out.
Dip a large paintbrush into the turpentine or paint stripper. The brush should be very wet with it.
Paint the turpentine or stripper onto the wall in smooth, soft motions until you have covered the entire acrylic mural. Let the turpentine or stripper stand on the wall according to the time given on the product's label.
Scrape the acrylic mural from the top down with a metal putty knife. The mural should come off in strips or large pieces. Sweep the pieces up with a dustpan and broom, and throw them away.
Sand down any rough edges on the wall; then repaint the wall whatever color you like.