How do you wash your baby bottles?

For me I use the traditional method. Wash with soap and use hot water once day only. After every feed use water and sponge to clean it. Some mummy will comment unhygienic not good etc. It depend on individual mummy. To me too clean will not be good as they are building their immune system now. We used to grow up like that too and we don't fall sick so often too so I go with traditional method.