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Scotchbrite General Purpose scouring pads, such as are sold in hardware stores, contain mineral particles ( probably aluminium oxide, which is the same as emery). They are capable of scratching both steel and glass. If you want to avoid this you have to find grades specially made for cleaning non-stick pans.
This is very helpful. I have been looking for a suitable circuit on Google but did not find this simple use of a 555 IC. Thank you!
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