Cleaning Tips
I’d experiment cleaning a few small areas differently to figure it out: keep the areas small and keep the containers in the area to avoid getting confused. Like the first area could be to buff it with a dry microfiber cloth, the second area with only hot water, the third area wash with a pinesol or fabuloso, and use a few drops of dawn dishwashing liquid on the last area. Rise all with clean water and. use separate clean rags to avoid cross contamination, dry with clean rags, do not buff to shine.
If the dry microfiber did best, its probably grout released that need to be resealed.
If the hot water did best, it was probably too much cleaning product in your original washing.
If pinesol/fabuloso did best, it was probably dirt and dust.
If dawn dishwashing liquid did the best, then you have an oily residue that needs to be removed.
Have fun!