Reversing pollination?

A question from a fellow grower:

Any way of reversing pollination process three weeks into flowering.

Not sure what you mean. But if the female buds have already been pollinated then there is nothing you can do, they will develop seeds.

An update:

how do I get rid of the pollen that is still floating around?

After the grow. A light bleach solution. A baking soda solution. soap and water. Clean everything.