Copper pads and cloth

Curious if anyone used these yet and your thoughts?

How does it compare with 0000 steel wool or white/walnut pads?
Copper is softer than steel and bronze, I believe. Just curious what you’ve noticed with them.

Never used them but nothing tops 0000 steel wool.

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I’m gonna try one. It’s $5, worth a shot.

Same here. My personal window can be the test subject.