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I don't have any specific experience to back up this opinion, but I don't think that the Waterpik would help that much.
The key to getting salt build-up out of the controls is not just soaking the housing in water but moving all the controls and pushbuttons while it is submerged. You can also try rubbing a little silicone on the outside of the pushbuttons and then activating them several times.
Of if you send the housing in for a rebuild that will definitely take care of your pushbutton problem.
After use, I soak my housings in warm fresh water and push all of the buttons repeatedly. I've never had a sticky button. (Knock on wood.)
It is funny to see that "fresh" statement in there but I would not be surprised if there is someone out there that was upset because they soak their unit in salt water after each dive and still get a darn salt build up
But the point here and from Jean about pushing the buttons while submerged is a good one. I do it on my still and video housings, but forgot to mention it.
It's a concentration thing. You can only really get fresh water into the button areas when pressing (it sucks in on the release). if you've let a LOT of salt accumulate, it's going to take several such 'flushes' to dissolve enough of it to not leave crystals. Once clean, it shouldn't take near as much effort after the next dive.
I wonder if salt has worked its way past the seals of the buttons.
Since there is no electronics in the housing, how about this idea: open the housing and soak the whole thing including the inside in distilled water ( you can buy this in large jugs) and press the buttons then. That would dissolve salt on both sides of the seals.