Need help on removing stains on bathroom tiles

Hello! I live in the Phils. Our bathroom water is not clear (on-going repair on underground pipes). My bathroom tiles are ceramic but unfortunately looks disgusting. Had a maid who scrubbed it so hard I think the seal was removed (had the same tiles on the first floor bathroom without this problem). Used home made cleaners, store bought, phosphoric acid based cleaner, sodium hypochlorite, etc. Kindly help me. Thank you!
9 inch ceramic white and black tiles for the floor
9 inch white tiles on the walls
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