This 16oz bottle is the same formula as the small Maintain spray cleaner in the AquaGlideXP kit.  Regardless if you had AquaGlassXP applied at the factory, or opted to use the at home kit, this spray cleaner will enhance the durability and performance of the protection when used for deeper cleaning. Most homeowners find that in addition to spraying their doors with water and towel drying daily, using maintain spray cleaner every one to two weeks keeps their treated doors looking spot free and like new.