OT
I was planning to replace my 1.5 yo smartphone, because the clickyness of its volume button had disappeared. nothing helped.
then I read about this great fix:
... put a little water over the button and push it several times until the clickyness comes back, then suck the water (and probably dirt) out of the button... (did it with a vacuumer). worked like a charm!
never thought a volume button clicking again would feel so wholesome....