How do you sand plexiglas to look frosted?

To sand plexiglass and achieve a frosted look, use fine-grit sandpaper, typically between 220 to 400 grit. Lightly sand the surface in a circular motion, applying even pressure to avoid deep scratches. After sanding, clean the surface with a soft cloth to remove any dust or debris. For a more uniform appearance, consider using a sanding sponge or a power sander with a fine grit attachment.