Is the CleanOxide Gel effective once it goes a clear white colour? A Is the CleanOxide Gel effective once it goes a clear white colour? No, the CleanOxide Gel is no longer effective once it goes a clear white colour. Back to Top Can I use the CleanOxide Gel in my car or in hot environments? Do I need to stir the CleanOxide Gel powder once I mix with water?