Things You Will Need
You can erase unwelcome marker messages with common household solvents, and then dry the cast as thoroughly as possible.
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Blot rubbing alcohol on the marker stain. Work from the edges of the marker stain toward the center.
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Rub gently until the marker stain is gone. Use as much rubbing alcohol as necessary, but don’t saturate the cast as this can weaken it.
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Sprinkle baking soda over the marker stain if it is still visible.
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Rub the baking soda into the marker stain with a scrubbing brush to remove the stain completely.
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Wipe the cast with a water-dampened cloth.
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Dry the cast completely with a hairdryer on low heat.