Looks too me like they are cleaning with a dirty greasy mop and the letting the floor dry. If it is procellian clean with a spinner using a mild acid base cleaner or a good degreaser if you do not have one and have to use a swing machine nylon brush or a pad and scrub the grout by hand. I do not see a reason to seal it once it's clean since a sealer will not held it stay clean in the future since it won't make the dirt jump off. I don't know what color the grout is but by looking at baseboards they also look to be black all the way up not just where a mop hits. After you get it clean you need top educate the customer on proper cleaning or get them on a maintenance contract.

Good luck, Bill Selik

Gourmet Stone Care

On Wednesday, September 27, 2017 9:20 AM, "info@stonewoodhouston.com" <info@stonewoodhouston.com> wrote:

That wouldn't reach deep inside the grout, I would use a brush instead of pad.

Sent from my iPhone

> On Sep 27, 2017, at 11:05 AM, Mark Winslow <midwesttileandstonemedic@gmail.com> wrote:
>
> I am bidding on a pizza shop floor is 2 years old never been sealed, they want clean and sealed, I believe it is porcelain, would a buffer and black pad or green pad work ok ?
>
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