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You can ask the master who does furniture beauty, and generally the people who sell furniture know their phone number!
The heating ducts will not blacken the floor, it may be leaning against the door, worn or caused by leaking pipes, take a closer look, haha.
It's not white. Paste some good-looking wallpaper, wallpaper or something, and another style will appear
This kind of black, if it is caused by high temperature carbonization, it is estimated that it can only be re-painted.
It can be repainted, or with self-adhesive wallpaper in the same color.
It is recommended that you wipe it with gasoline, but not too much, first use hot water to blanch the blackened area at high temperature, and gently wipe it with a towel dipped in gasoline, I hope it can help you.