Why does some spots on tiles remains dry even if I mop it again and again

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Why does some spots on tiles remains dry even if I mop it again and again

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Fat will repell water, very hygroscopic (water attracting) stains will pull the surrounding water away, certain structures and geometries assist in the formation of drops of water, which will pull in more surrounding water

All of which will prevent a homogenous film of water on the surface.