Do I need to keep the CleanOxide Gel in an elevated position? A Do I need to keep the CleanOxide Gel in an elevated position? No, but we recommend to keep CleanOxide Gel out of reach of children and to also avoid potential spillage. Back to Top Will the CleanOxide Gel still be effective after 30 days? What levels of Chlorine Dioxide should I be testing for when using the Chlorine Dioxide Test Strips?