"The Menicon SP-Care cleaning and storage solution has been specially developed for cleaning and preserving the moistening ability of hard-flexible, oxygen-permeable contact lenses. Regular and thorough cleaning is important for the preservation of contact lenses.
After manual cleaning and storage for 4 hours, your contact lenses will be safely disinfected. If you do not wear your contact lenses, you can store them for up to 30 days in a closed container filled with Menicon SP-Care. Any longer and they have to be re-cleaned and the liquid changed."