Security ink is permanent, which makes it difficult to get out of clothes. According to the Iowa State County Extension Office, treat the stain immediately and blot it rather than rubbing, which will only spread the mess.
Blot the stain immediately with a clean, white cloth. Press down on the fabric firmly to lift up as much of the stain as possible. When the cloth becomes stained, fold it to reveal a clean surface and blot the stain again.
Place a few drops of isopropyl alcohol on the stain with an eye dropper and blot. Repeat the process with a few drops of acetone.
Rinse the garment and pour 1/8 cup of heavy-duty liquid detergent on the stain. Soak the garment in a sink or bucket filled with hot water for 30 minutes to one hour. Add 1/8 cup of color-safe bleach to the water.
Soak white garments in chlorine bleach following the same process outlined in step 3. Soak garments in chlorine bleach for 15 minutes only.
Rinse the stained garment and wash in a regular wash cycle, using hot water. If the stain remains, repeat the process.