Natural methods to repel and eliminate rats without using toxic chemicals:

Using Roasted Rice and Cement:

Mix roasted rice, sesame oil, and cement.
Place the mixture in areas where rats often appear.
After eating, rats will feel thirsty, and when they drink water, the cement will harden in their stomach, leading to their death.

Using Baking Soda:

Mix baking soda with flour and sugar.
When rats consume it, baking soda reacts and produces CO2 gas, which paralyzes and eventually kills them.

Using Mashed Potatoes:

Boil potatoes, mash them, and mix with cocoa powder or vanilla.
Place the mixture near a bowl of water.
When rats eat the potatoes and drink water, the potatoes expand in their stomach, causing digestive blockage.

Using Vinegar:

Soak cotton balls in vinegar and place them in areas where rats often pass.
The strong smell of vinegar will drive the rats away.

Using Soap:

Mix soap powder, Sichuan pepper powder, and cooked rice.
Place the mixture in areas where rats appear; the strong smell will make them avoid these places.

These methods effectively repel and eliminate rats without harming human health.