McKesson eye wash cleanses the eye and helps relieve irritation or burning by removing loose foreign material. This sterile solution is great to have on hand for daily or emergency eye cleansing. - 98.3% purified water. Cleanses the eye and helps relieve irritation or burning by removing loose foreign material. Screw cap protected by a plastic tamper-evident seal. The rate of flow is affected by the pressure applied to the bottle.. Sterile.