How to Clean Eyelash Extensions To clean eyelash extensions, gently wash them daily or every other day with a specialized, oil-free lash cleanser or a baby shampoo mixture, using a soft brush or fingertips. Apply the cleanser, gently cleanse the lashes and lash line, then rinse with water and pat dry with a lint-free cloth. Follow up by brushing the lashes with a clean spoolie to set their shape while they dry, and avoid using oil-based products or rubbing the lashes to prevent damage and poor r