Go to the pet store and get the stuff for keeping pets specially cats off of furniture /out of gardens. and apply it liberally around and under the porch (if you can get it under there). Be carefull, when it hits them they will come out of undder there pretty quick and you don't want to be in the way. Also spead or spray it around the perimeter of your property apply it repeatedly over a couple of days so they don't return to your yard and take up residence in another area. They feel safe there now and they will return if you don't make it uncomfortable and scary to them.
Once they leave wrap some chicken wire or place wood lattice around the porch to keep them and other animals from getting in there.
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