Malish-ScrubFlex [RED] Tile and Grout Brush (Modified for the Orbot) OSFB 17R
The RED Malish ScrubFlex 583417 is equipped with a Velcro felt backing that securely grips the Orbot pad driver. It can be attached to an Orbot Vibe or Orbot SprayBorg Velcro drive plate. If your machine has a bristle pad driver – install a 19" black stripping pad and then attach the Scrubflex brush to the pad.
So far I have only used it on a large master bathroom white tile and grout. The grout was almost black with lots of hair spray. The brush quickly scrubbed it right out with the Orbot Vibe. Didn't even use the tile spinner. I rinsed with a Floorwash 5000 and then used a microfiber pad on the tile to finish. Turned out great!