There are hotels squatting in Nanchang.

So, listen to me, you go to the place where chemicals are sold. There is a place where chemical reagents are sold in downtown Nanchang. Buy some caustic soda, also called sodium hydroxide, and dilute it with water, with a concentration of about 30%. It will be very hot when diluted. Just pour it into the toilet while it is hot, wait one night, or one day, and then pour it back and forth with a big suction cup, but try not to pour the solution on your skin.

Of course, it is better to buy sulfuric acid, but I believe it is difficult for you to buy it. You can also ask where there are batteries, but if you don't know how to use sulfuric acid and its nature, I suggest you don't use it. It is too dangerous for people. If you know it, it is not dangerous.