Q.peace lily flowers
What do I do with the flowers of a peace plant once they have died off. Once the white lily-like flowers of the peace plant turn green and the stamen loses its pollen, what should I do with it? Should it be cut down or just left alone?

You cut the stalk of the spent flower right at the base of the plant.
For more information on the care of peace lilies, please visit the following link:
https://www.gardeningknowhow.com/houseplants/peace-lily/peace-lily-plants.htm