High-ozone shock treatment
High ozone shock treatment or ozone blasting is a process for removing unwanted odour, and killing mold, vermin and microorganisms in commercial and residential buildings. The treatment is less expensive than some alternative methods of sterilizing indoor spaces - cleaning or removal of building material, or in extreme cases the abandonment of sick buildings.
Source: Wikipedia — High-ozone shock treatment (CC BY-SA 4.0)