Oddly enough, I store them in a case because if I just leave them on the bedside table then I tend to reach out in the middle of the night for (say) a glass of water, hit them by mistake, and get grubby fingermarks all over them. So it's done in the cause of not having to clean them too often. I can't win :-)

I'd be more worried about knocking a glass of water over!

Mostly I don't worry too much about getting mine grubby as it only takes 30 secs or so to polish on a tshirt. But then I can live without mine if I have to, which might make my attitude to them different.

As a kid I used to jsut live with them dirty ;-)