Solution: porch is the fundamental solution.
If space does not allow, you can use my following methods:
One hangs a bead curtain on the toilet door.
B put plants at the door of the bathroom, with round leaves, thick leaves and trunk.
C toilet purification:
Be sure to open the bathroom window and close the door to let the dirty air out. Don't put it in the house or hall. It's wrong to open the bathroom door and discharge all the dirty air into the living room. Don't go into the living room. The simplest purification method is to use salt, which can ward off evil spirits.