What does it mean to enlarge rice on the courtyard wall?

The moral of enlarging rice on the courtyard wall is:

First, you can get the protection of the gods here, and second, you can protect your home with the help of the gods, so as not to let all kinds of things outside invade your home, and ensure the peace of your family and the prosperity of your career.

There are many ways to clean the house, the most common one is to clean the house with whole grains. There are different opinions about whole grains. We use rice, millet, sorghum, mung beans and black beans (white, yellow, red, green and black respectively, so there are also five elements here).

Prepare some whole grains (three grains per person) before cleaning the room. Rice, millet and sorghum are best shelled), three cups of pure water, three cups of white wine, three feet of red cloth, a big bowl, a piece of red paper, five steamed buns and some sandalwood.