Using steps: Step 1: Wash and dry hands and breasts thoroughly, keep the skin dry. Step 2: Uncover the dust film. Step 3: Gently place the nipple cover onto the nipple, pressing the outer edge firmly to stick to the skin. How to clean reusable nipple covers? Step 1: Wash nipple covers gently with soap and cool water. Step 2: Set aside and allow nipple covers to dry completely. Step 3: Once dried, add the plastic film back onto the adhesive. Attention Do not use moisturizers, perfumes, powders, or other skin care products before using. This can reduce the effect and stickiness of the adhesive. Not recommended to use on damaged or inflamed skin. Not recommended to wear for over 8 hours.