White powder appeared on the balcony of the house

That's bugs.

If there is rain, it may be that the scale in the water vapor has adhered to it.

I don't know what the name is, but it should be harmless. This insect pat hot water. In fact, as long as you wipe the cabinet clean, the bugs will naturally disappear.

Is the wardrobe white?

If the wardrobe is white, then the white powder is the paint dust left when polishing after spraying the primer, it is best to clean it up, if the wardrobe is not white, it is the wood grinding dust left when the wardrobe is polished with white stubble, the wood grinding dust is not toxic, to put it bluntly, it is very, very fine and very wood slag. >>>More

If you want to, just throw it away.

If you are reluctant, you need to find the insect moth spot first, and then buy some lemon essential oil for women, and repeatedly brush it on the wood with insects, which can also be solved. >>>More