I agitate the kitchen with a pole brush and use my Otter pump with 600-700 psi high heat works great, I don't have to agitate the rest of the areas, 600-700 psi with high heat will do very well. I do use the gekko wand with a brush head. I can never use a spinner because I can't clean the sides and the edges and some small areas and tight areas. Gekko is great for residential. Open areas the spinner.
Do you have to do multiple passes on one section of grout or just one pass typically? Fast/slow pass?