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Why are they stuck? If it's from some ookies in there, I'd do a super soak first.
Nice warm water and some dishwashing liquid...soak for a while, push the buttons a few times during the soak. Nice warm water rinse, push da buttons. Dry thoroughly, push dem buttons again. Repeat if they're getting there but not quite.
If that doesn't help all the way you might want to do the silicone on a stick trick to dribble some down in there.
So anyone got a neat trick for stick canon UW case buttons? Spray silicone etc.?
thanks.