Sweep up any dry salt up with a broom and dustpan. If the salt is dry, it will be easier to sweep.
Add 1 tbsp. borax and 2 tbsp. ammonia to a gallon of warm water.
Dampen a soft cloth in the mixture and wring it out until the cloth is almost dry.
Scrub at the salty area on the floor tile. Rinse the cloth as needed, wringing it out each time.
Rinse the area with fresh water and dry the tile with a dry, soft cloth.