I saw a video somewhere online... I forget where. They dude was testing out a magic eraser on a panel. It looked like it had been wet sanded by the time he was done.
When they first came out, they were similar to 1500 grit sandpaper. At this point with knock-offs abound it is hard to tell if they are all the same, so use similar caution as you wood any sandpaper in a range that works best for you.
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