I concur on the Miracle Sealant. I don’t have much experience on ongoing maintenance but as far as install I have always used paint thinner and linseed oil mixed 50-50 and sponged on with a grout sponge and let it soak in before grouting. The tile is so porous that, it will stain when you grout. After grouting it would sit for a couple of weeks then sealed. Here is Arizona where the humidity is usually in the single digits, a lot of people don’t seal their outdoor Saltillo tile after installation. You wet it down with the garden hose and the water soaks in and as it evaporates, it cools and slightly humidifies the air around. Prolly not so necessary for Florida though.
Saltillo is really popular here and people are paying big money for “specialty tile”. Because Saltillo is cured in the open air, occasionally coyotes, cats, deer and more often birds will leave a footprint in the tile. In some areas it is believed that if you set a tile with an animal track at the front door, it is good luck for those that enter. There are some here that I hear have bought all of the tile with deer foot prints that they could find and placed them throughout their house to make it look like a deer had been walking through. Crazy expensive I’m told. A lot of people here also don’t want the real clean look as the weathered, aged look is appealing to many. I think I’d be a little careful with the pressure washer thing maybe more of a brush cleaning. All in all saltillo is a real PITA for the flooring guy. Good luck.