Welders often store their welding rods in an old refrigerator with a light bulb on 24/7. This keeps them warm and dry.
Do you suppose the same would work for detailing products? It'd be more convenient to keep them in the garage.
My garage is attached and while it'll get cold it didn't freeze last winter. I also have a Modine heater for the really cold snaps...but I ask for the sake of general opinion.
Peter..in Denver