ANSWER: For your black granite FLOOR I would recommend using our “InterCare” Cleaner (Marblelife Marble & Travertine Cleaner). It’s available in ready-to-use spray and concentrate for a solid economical value. We do not recommend any conditioner or polish on black granite other than what a trained professional can deliver.We have a new video on YouTube that shows some helpful tips in keeping a beautiful shining floor with less effort and in a eco-friendly fashion. This along with other helpful videos can be found at www.YouTube.com/MarblelifeVideos. The video is called “Marblelife Care Products”.If you have any further questions or we may be of any other help, please feel free to contact us.