How to deal with this evil neighbor?

Such a simple question! Excuse me, did he take out the garbage from his toilet, and then the garbage flowed into your toilet and blocked the sewer of your toilet? 、

In that case, I suggest you put the pipe on your roof! Take it down and stuff it with camel cotton or rotten clothes into the pipe connecting him upstairs and plug it up for him. So as long as you block his pipe, won't the flushing water flow all over his room after he goes to the toilet?

He can't ask anyone who doesn't use the toilet.