What should I do if I meet such neighbors and properties?

First of all, you have problems, such as illegal decoration and improper use of water pipes, which are the root causes of a series of problems.

Not every balcony is equipped with a washing machine. Only balconies with sewage fittings can be designed and installed, but balconies in old communities do not have this function.

The downspout is used to drain the rainwater under the balcony, because the water quality is not polluted, and the lower end is directly discharged to the ground. You have closed the open balcony, so you shouldn't use it to drain water, because the water has no drainage system and can only be poured back to the first floor. If you want to solve the problem, you should move the washing machine to the ground.

At the same time, you should be glad that there is no property loss on the first floor, otherwise, if the other party claims, it will be reported one by one.

In fact, the first floor is unlucky enough. When you meet a neighbor like you, you are still polluting the environment.