My favorite use case for those things is shower/bath scum.
Thy’re just the right amount of abrasive to lift that nasty mix of soap, mineral, and biofilm that usually requires both harsh chemicals and heavy scrubbing to dislodge, with just a quick wipe. Plus you can throw it away after.
I have had bad experiences with durability on the generic ones, but you can usually get a bathtub out of even the crappiest.
