Shower Spray Nozzle Sticking

[mgabsa]

The button for my shower spray nozzle sticks, and it's not the lock slide. I had to kill it at the switch. Later it was off when I switched it back on, so I'm guessing it's just sticking.

Anyone know how to fix this?

 

[tomcoombs]

Corrosion? Perhaps you can remove the head and soak it in CLR, or something similar?