Easy targets: Brass valves + copper pipes left on the hot water tanks, electric motors, car/truck batteries, aluminum house siding, aluminum barbecue grills. Propane tanks have their own forum thread, it is very important to read it if you want to deal with. Lawn movers are a pain to separate clean cast aluminum from iron and usually very oil and grease dirty. If you want to take a picture with your cell and post it here, we can have a look and see if we spot something else.
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