Prepare Medicine Vial: Remove the safety cap from the vial and discard. This exposes the rubber seal. Once the safety cap is off you can't replace it. Cleanse the top of the medicine vial by swabbing with several firm strokes over the rubber seal with alcohol wipes or a cotton ball wet with alcohol. Move the swab or cotton ball forward, pick it up and move it forward again. Do not rub back and forth. Clean for 30 seconds and then let the alcohol dry.