Test the method on a small hidden area first
Rub the mark with isopropyl alcohol on a cotton ball or cloth
Wipe with a damp cloth
Use a dry-erase marker over the Sharpie, then wipe it off
Apply a small amount of baking soda mixed with water and gently rub
Try hand sanitizer on the stain, then wipe clean
Use a magic eraser lightly on the plastic
Apply a small amount of acetone-free nail polish remover if needed
Wash the plastic with soap and water after cleaning
Repeat the safest method as needed
Avoid harsh scrubbing on soft or glossy plastic