Hi, Christy. Go to www.dumondchemicals.com. They make several different varieties of a product called Peel Away. This will be excellent for removing the paint from your porch.
Ask them which formulation they suggest for this application and where to get it. I believe that they will suggest Peel Away 7. Tell them as much as you can about the kind of paint used and anything else about the project that seems important. Tell them that Henry in MI from the *** **** board sent you.