If it breaks just keep on going. Most yards will accept the low grade boards broken, if they accept them at all. Once you have a nice pile of "dirty" heat sinks just take some time and clean all of the garbage off, i.e. transistors that are screwed to the heat sink, and the left over circuit board remnants. It really doesn't take very long for me to clean about 50lbs...maybe half an hour or less.
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