Granite stone First job

My first serious wash, and I am confused…
These are granite floor, client said that is years of stain, tried to remove with broom scrubbing but they didn’t made it. As soon as he saw my video he want me to try.
Will sh do its magic?

Should, that and your surface cleaner. Doesn’t look all that dirty in pics. Start with about a 1-2% mix. That should be plenty