system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do Magic Erasers (those little sponge-block things made by many companies including Mr. Clean) work?
gpt
They are abrasive (like steel wool or sandpaper), just a very fine grit. Their amazing cleaning comes from physically scraping dirt off on a very small scale.

As an aside, Magic Erasers are way overpriced, you can buy the exact same sponges in bags of like 100 for a few dollars on Amazon (or other online retailer). Search "melamine sponge".