Hi Maai, I don't believe there is a specific way of grouting Mexian tile than any other type of tile depending on the situation. Here's a post devoted to grouting tile: https://justagirlandherblog.com/installing-and-grouting-tile-50-tips-and-tricks/

I found these too...

https://www.hometalk.com/38486141/q-how-to-add-grout-to-existing-grout-on-a-floor-with-mexican-tiles

https://www.hometalk.com/31413513/make-your-grout-look-like-new

How to Grout Mexican Tile

https://www.askthebuilder.com/grout-mexican-tile/

How to Choose the Best Mexican Tile Grout Color (2019 Update)

https://rusticotile.com/choose-best-mexican-tile-grout-color/

GROUT FOR MEXICAN AND SALTILLO TILE

https://www.mexicantiledesigns.com/pages/grout-for-mexican-and-saltillo-tile

Here is some information I found:

https://rusticotile.com/choose-best-mexican-tile-grout-color/#:~:text=Mexican%20tile%20grout%20is%20not%20just%20an%20“upsell”,along%20the%20edges%20and%20from%20wearing%20down%20prematurely.

Here are couple that might help you: https://www.mexicantiles.com/how-to-install-ceramic-tile.html

https://rusticotile.com/saltillo-tile-grout-tips/

Hi! maybe this will help

https://www.mexicantiledesigns.com/pages/grout-for-mexican-and-saltillo-tile

Saltillo is not a “trued” or square tile and therefore the grout joints are typically fat and that means using a polymer or acrylic enhanced grout.

You’ll also want to invest in a non-yellowing dealer.

Are you wanting information on installing Mexican tile, or how to re-do the grouting?

Hi Maai: Here is a site that shows a lot of other sites about Mexican Tile Grout: https://www.bing.com/search?q=grout+for+mexican+tile&qs=RI&pq=mexican+tile+grout&sk=AS1RI1&sc=3-18&cvid=335C71B5E0454AE7A70F3038053AAC87&FORM=QBLH&sp=3 Good luck

Hello Maai,

The grout used would be a waterproof grout and will be available at your local DIY store.

Best wishes ,

Hello Maai, hope this helps you out,

https://www.youtube.com/watch?v=StkvkBpz0e8