Shriektronics is a local contractor in Night Vale, and the only one in town which specializes, or at least used to specialize, in removing screams. They recently moved their offices to several miles deep underground, and mostly just generate earthquakes for the government these days.
Cecil mentioned Shriektronics in The Mayor, saying how hard it was to remove the screams off the darkened corners of the Post Office, due to the Shriektronics' transition underground, and the lack of other contractors capable of carrying out such task. The Post Office had to spend months cleaning the blood off the walls and hire who-knows-what kind of specialists to remove those screams after the Apache Tracker has been there.