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How to remove the stains from the floor tiles?

We installed patio tiles on the covered balcony in our new construction apartment.

They have CleanKeeper plus sealer. I noticed that they scratched very quickly and attributed it to the grittiness. I scrubbed the tiles with water and detergent separately, and now they have brownish stains on them. What am I doing wrong? The tile looks so dull. I can't get rid of the stains.

• tiles
• floor
• stains on tile