Why is there oil on the feng shui master's wall?

There will be more or less oil spill during construction.

You can try to gently polish the polluted wall with fine sandpaper. If the wall is painted with latex paint, it has a certain waterproof effect and will prevent the oil from penetrating quickly. You just need to polish off the oil stains on the top coat, and be careful not to expose the primer. If the primer is exposed, the top coat should be repainted.

Prepare a towel gourd and a bottle of floor cleaner, squeeze the floor cleaner on the towel gourd, then rub it repeatedly on the macula oil stain on the wall, and then rinse it with clear water.