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Is there a certain amount of moisture mixed in the bathroom?
The house that has just been renovated will see rust every two hours, it is likely to be rust caused by moisture erosion, LZ may wish to check whether the waterproof of WC is done, and whether the hook and seam on the first floor are finely scraped.
Hope it works for you ...
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This is a problem with your hook and seam
What to fill the gaps in the bathroom tiles can be waterproof, and the joint material must be selected to ensure that the bathroom does not leak.
To be on the safe side, seal the insurance with 995 structural adhesive (black and white colors can be selected according to the color of the floor tiles).
First, the most direct is to wipe it off with a wire ball; >>>More
Floor tile joint cleaner usage:
Wet the tile cleaner with a sponge or rag, wipe the contaminated surface, and then rinse generously with water immediately to prevent the tile cleaner from remaining on the surface and turning white. >>>More
It can be used in white series, porcelain white or pearl white, simple style.