I would go with any of these fine products for maintenance like BLACKFIRE Midnight Sun Instant Detailer or BLACKFIRE Midnight Sun Spray Wax after every other wash on the car.
Great question. I will write an article on how to maintain BFbI soon! You can any of the products you mentioned and you may find their performance/look favorable to BLACKFIRE's. However for the best performance and maintenance of the wax I would stick within the BLACKFIRE line. I will work on a more detailed article on why soon!