''It’s usually bed frame angle iron , old batteries and Aresol cans that don’t spray.'' Well, bed frame angle iron has made me a shitload of shelves in the barn & garage. I traded all my dead batteries to O'Reilly for $10 credit each. The dead bomb cans sit in a rack until I need that color, then we drive a nail into the top & drain into the touch-up gun. (You might want to throw a red rag over the nail first.} There is no bad "free shit" ... just some of it is better shit ...