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This is Hu Feng or hornet's nest, it is recommended to deal with it as soon as possible, otherwise there will be certain safety hazards.
This kind of insect likes hot and humid places, and it can basically be eliminated by keeping the kitchen and bathroom ventilated and dry on a clean basis.
Millipedes and worms. Like to grow, in a dark and humid environment, keep the environment dry, clean, with appropriate insecticides.
It should be, spray with insecticide, and sweep it off.
If the toilet wall is tiled, the surface stains can be cleaned and many detergents can remove it. However, if the quality of the tile penetrates into the inside of the tile, it is impossible to remove the stain. If it is a newly bought tile, you can find the seller to theoretically. >>>More
This is a natural tree knot on solid wood furniture.