[930addict]

I inherited my old playground set from when I was a kid. Included is a 12 foot slide. I'm not sure what kind of metal but the face of the slide is rusty. Structurally it is sound it seems like just surface rust. I tried scrubbing it with naval jelly which seemed to get some rust off but left the heavier rust. So how would you go about refinishing this? I wanted to try to do it myself to save some money.