If you have access to a pressure washer then spray it down. If its just flaking pain t it will come off and you'll be able to repaint it. If it is a crack it will probably only come off around the area of the crack. Then you'll be able to see it better. And after you're done, if it isn't cracked you'll be all cleaned up and ready to repaint it. Personally, if it is cracked and still runs good......ya can't see it from my house.......run it till it dies!!!!!!