Cement, wood, composite decking?
If it is cement, wash with warm water and dish soap. Rinse with cold water.
Enclosed porch? Open Porch? Any drainage holes in any walls along the floor?
If it is cement you can pour pool chlorine on it and wipe it around with a broom then let it dry before rinsing it. Make sure to wear clothes that you are not worried about them getting bleached and wear eye and mouth covers.
we have porch with TREX MATERIAL not wood, Thanks