In the temple what is the difference between women being pronounced clean and that men may become clean?
This is one of the great inequities of being born a man on this earth. Men have a greater burden to bear in order to be worthy before the Lord.
That said, I think it’s important to point out that your question contains an incomplete statement. It is to become clean from the blood of this generation.
Those who bear the priesthood are required to spend their time, talents, and means to push back against the sin & decay of each generation. That is part of what the priesthood is for. Women bear no such responsibility. They only need to worry about their own sins, not the sins of others.
President Nelson said in a recent Conference:
Today I reaffirm strongly that the Lord has asked every worthy, able young man to prepare for and serve a mission. For Latter-day Saint young men, missionary service is a priesthood responsibility. You young men have been reserved for this time when the promised gathering of Israel is taking place. As you serve missions, you play a pivotal role in this unprecedented event!
For you young and able sisters, a mission is also a powerful, but optional, opportunity. Preaching the Gospel of Peace
Men and women both have many traits that are unique to their sexes. Some traits give us various strengths. But with those strengths come various responsibilities.