sanitization

US /ˌsæn.ə.təˈzeɪ.ʃən/
UK /ˌsæn.ə.təˈzeɪ.ʃən/
1.

sanitasi

the act or process of making something completely clean and free from bacteria:

:
For more thorough sanitization, put the feeding tray in the dishwasher after use.