Renu 1 step lense solution is not very useful other than any type of lense solution. Its not comfortable for me.its not work properly like others are dirt removd from lense and other bacteria but renu is not work properly so it’s very harmful for eyes. After it used the lense was irritating in eyes its cause rash in eyes also.Afterward this incident I don’t use Renu 1 step Enzyme lense solution.