Is it unnecessary to sterilize nursing bottles, nipples, etc., if I use Pigeon Liquid Cleanser for cleaning?

Please sterilize nursing bottles, nipples, and other parts after washing them sufficiently with Pigeon Liquid Cleanser. You may use any of the following methods: sterilization by boiling, microwave steam, or with a chemical solution. In addition, when sterilizing with microwave steam, please use a special sterilization container.