Yes, Mosaic del Sur sells cement tiles and recommends the modern-traditional methods of proofing and polishing.
Because of our clientele our situation is different in the USA. We do not have small services who will come out and crystalize your tiles. It is done by huge companies who arrive from across country in a 40 ft truck with ride-upon machines. They crystalize floors in gigantic stores like Home Depot, Costco, Sam's Club, Wal-Mart. They are not interested in small projects.
So we experiment endlessly with top-coat type 'sealants' to provide good protection from stains and as close to a no-care finish as possible. We live in a no-wax society. It is not even sold in most stores here any more. Quite a challenge for us. I suppose this falls under the "transparent composites' mention on the M del S instructions.
I lived in Costa Rica 40 years ago and the floors there were polished daily by the young girls in the family w/ pieces of coconut husk. The floors were gleaming.
As for grout clean-up.
I have not tried the sawdust method but have watched it being used. But it was water-dampened sawdust. No oils.
I am very interested in any advice on no-care top-coat finished for cement tile available in UK.
And the restaurant and home owners are not interested in maintaining a paste wax finish on top of an impregnator so therefore are not protected from stains like red wine. We also find that installers have a more is better approach to impregnators, and the gummy residue left behind grabs dirt over time.