Yes you wash them as if you would wash your dishes and then sterilise them before use everytime.
If you’re using formula they must be sterilised after every use. Once sterilised they can be put back together and will remain sterile for 24 hours
All bottles should be washed with hot soapy water and then sterilised before every use. They are then sterile for 24 hours.
Wash with hot soapy water after use, sterilise before use.