OptiFree Express MultiPurpose Disinfecting Solution uses an exclusive formula for cleaning, disinfecting, and removing protein deposits from contact lenses. OptiFree Express solution cleans by loosening and removing any buildups of protein or other debris that attaches to the lenses. The solution will also eliminate dangerous microorganisms on the surface of the lenses to ensure that infections do not occur. The exclusive 2D formula, which contains Polyquad and Aldox to help get rid of microorganisms that can cause eye infections. Let the contact lenses soak inside the lens case for a minimum of 6 hours or overnight. It is safe to leave contact lenses soaking in the solution inside of a closed case for up to 30 days before being cleaned and disinfected again. OptiFree strives to continue providing patients with the newest and most effective contact lens products on the market for dry and irritated eyes.