Clean/Dirty Magnetic Indicator
thingiverse
Another clean/dirty indicator or you dishwasher, washing machine, etc. I used a magnet that I had laying around, but these should work. https://www.amazon.com/Multi-Use-Magnets-Refrigerator-Science-Whiteboard/dp/B07MYQV446/ref=sr_1_3?dchild=1&keywords=1%2F2%22+magnet&qid=1616096001&sr=8-3
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