ReNu MultiPlus® Multi-Purpose Solution: The Proven Choice for Healthy, Comfortable Contact Lens Wear.  ReNu MultiPlus® Solution is a trusted brand with a history of proven success. For over a decade eye care professionals have been recommending ReNu MultiPlus and it has been successfully used by millions of contact lens wearers. ReNu MultiPlus effectively kills germs in just 4 hours – so it helps keep your soft contact lenses comfortable and your eyes healthy.