How can I get a tan stain color off my white tiles?
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hope this helps
https://homeguides.sfgate.com/getting-stains-off-white-tile-80926.html
https://www.bhg.com/homekeeping/house-cleaning/surface/tile-stain-removal-guide/
You might try a baking soda paste with lemon essential oil added. Scrub and spritz with white vinegar (will fizz from reaction).
Scrubby and some Clorox cleanup