So I brought it home and scrubbed it clean. There were some areas where the old paint was chipping off, so I used some sandpaper just to smooth out those spots. This rake must have earned its keep because it is bent and warped. I hammered some of the spokes to make it a bit flatter but I don't mind the used look so went ahead and painted it.
If you wanted to make one of these but don't like the bent look of an old used rake, you could always buy a new one and dismantle it. But this one was free, so I'm embracing the bends!