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Take a good photo to the paint department of the home improvement store and ask them what will work for you. They have the best selection, the most up-to-date materials and most important, the most informative sales staff to get you what you need for a professional job.
Here are some sites that can help you: https://www.hunker.com/12178079/how-to-clean-mexican-tile-floors and https://homeguides.sfgate.com/clean-saltillo-tile-naturally-26356.html