I use bottle cleanser as well, and I still use the bb清潔劑 before put them in the cleanser. I have read the book suggested that after washing the bottles with 清潔劑, you have to wash the bottles two times from running water so that the bottles will have no chemical left. I also believe that bb 清潔劑 is lighter then adult, so I am comfortable to use.
For formula, I understand that it's better to pull powder in 60C hot water. If you put the formula in a very hot water, it will destroy some of the nutrition. Since I don't have a hot pot for 60c, I ususally mix hot+cold water to 偏熱.