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I agree that cleaning "valuable" coins reduces the value that's why I chose non-valuable coins, but probably a good idea to note something in the Instructable that cleaning older / more valuable coins should be done with discretion.
Fast & Easy Coin CleaningView Instructable »
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Seems perfectly reasonable! Perhaps adding a brief explanation in the description of the Instructable could help bridge the gap of understanding between RADAR & LiDAR (or even a link as I know most people don't want to read lengthy instructables). This is a great project/application that people can relate to (since it involves the eyes) and would be an excellent way to explain how RADAR & LiDAR are similar, but different technology. Again, job well done!