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1. It may be the residue of various materials, scale or toiletries.
2. It may be an oxidized sewing agent or caulk.
You can clean it with a detergent cloth or a steel wool toothbrush!
Yipai tile will answer for you!
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This one could be rust or something.
The water will only come out of the storm, that is normal. If this is the case for many years, it may be that there is a water leak somewhere
I can't name it, I've seen it, it's very small, I don't pay attention to what you can't see, I later closed the seam with Huabian filling material, and now I don't seem to have seen the little worm.
Such a leak may have leaked from the upstairs floor bath, now that the weather has gradually warmed upstairs, and the upstairs is about to start bathing again, you have to go upstairs and urge them to check carefully and fix the leak.
If you don't do waterproof tiling, you may seep water, and it doesn't look good if you do waterproof tiling.
wall, but if you understand.
Remember to have them make a wall and press the floor. >>>More