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Before washing, it is best to soak it in washing solution for a period of time, and it should be okay to wash it; If this doesn't work, you can only use the tools, which are sharpened off with a grinding wheel.
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There are special tile cleaners, such as Mr. Vermeer, which are sold in large supermarkets, which are milder than oxalic acid and do not damage the surface.
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Is your floor glazed or polished, according to what you said, the color is usually soaked in it! Can't do it! You must not wipe it with a steel wool ball! That would be worse!
You can use dish soap to clean it. After washing, scrub it again with laundry detergent, and finally mop it clean with a mop.
If it is not easy to wash, you can wash it with dilute sulfuric acid, but pay attention to safety!
Cleaning floor tiles:
1. The ordinary ash and dust on the surface of the tile can be cleaned with dish soap, soap, laundry detergent, etc. >>>More
You can give it a try and wash it with vinegar.
Or wash it with baking soda. >>>More
With tile cleaner, which is available in supermarkets, you can remove the dirt from the floor by choosing the kind of oil remover.