Will government departments deal with random advertising slogans written on rural exterior walls?

Yes.

Anyone who pastes advertisements or writes advertising slogans on the wall without approval violates the relevant provisions of the Advertising Law and the Regulations on the Management of City Appearance and Environmental Sanitation and shall be prosecuted by the industrial and commercial authorities or the city appearance management department in accordance with the law. Punish the perpetrators in accordance with the law.

Rural areas have specific natural landscapes and socioeconomic conditions. They refer to places where workers mainly engaged in agricultural production live together. They are different from cities and towns where people engaged in agriculture gather.