Use rubbing alcohol on a cloth and gently wipe the marker
Try hand sanitizer and rub the stain
Apply dry-erase marker over the permanent marker, then wipe it off
Use a magic eraser on hard surfaces
Dab with acetone or nail polish remover on non-plastic surfaces
Use white vinegar mixed with baking soda on washable surfaces
Wash fabric with stain remover after treating with alcohol
Repeat the method as needed until the marker fades
Test any cleaner on a small hidden area first