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I’ve rented from Depot, also a local power tool shop when I needed a bigger trailer based one. Both were quite inexpensive, especially compared to having a crew do the job.
Yes, it’s like really super fine sandpaper in a sense, which is why it works. If you have a acrylic tank, I would do some research before cleaning the display panels with it.
If they work for your tank, you can get a much better price. That is just a branded version of a melamine sponge. I've gotten 100 packs from amazon for $7. They help make boat clean up better.
Dave