We use Milton brand, Oh and there’s brushes made for bottles to make it easier to clean the inside :D
Wash everything with baby dishwashing liquid. Dont soak bottles or any baby things in kitchen sink. We used dr browns sterilizer and dryer - to sterilize and dry baby bottles, pacifiers, etc.
Fairy and hot water then into the microwave to sterilise (self sterilising bottles).
There’s dishwashing liquid but made specifically for baby bottles give ur local shops a little look hopefully they have in stock