I bought these so I don't have to towel dry the walls of the shower when I'm done. I'll say they're not very rigid and tend to flex if you push them too hard, but they're all silicone (except maybe the plastic which is the strength element inside) so they're easy to grab . . They wash off smoothly and don't seem to leave streaks. Haven't tried them on glass or as a mirror to know for sure, but I think they'll work well for that purpose too.
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