Washing baby bottles with soapy water alone doesn't always remove ground in milk protein, pulp and juice residues, which can cause baby stomach upsets. In response to this problem NUK has developed the Baby Bottle Cleanser specifically for cleaning all types of baby bottles, soothers and accessories. It is based on natural ingredients and contains specific enzymes which effectively remove milk protein, pulp and juice residues. Its mild formula makes it 'baby safe'. Simply add a measure of the NUK Baby Bottle Cleanser to a little warm water, and wash your baby's bottles, teats and accessories thoroughly using the NUK 2-in-1 bottle and teat brush, then simply rinse away. The NUK Baby Bottle Cleanser is more effective at removing milk protein, pulp and juice residues than soapy water alone but doesn't replace sterilizing baby bottles, this stage should still be undertaken after using the NUK Baby Bottle Cleanser.