my buddy and I both got Black Diamond Contour flick lock, for snow, mud, stream crossing.
When I get home, I wipe down the moisture dry, and once a year I separate the 3 sections to remove the dust from inside the tube. In winter I add the snow basket on only one pole, because I like the diversity.
I store with the flick lock open.
I tighten with a phillips screw driver as needed, usually once a year, if I suspect slipping.
I once used WD-40 because the bottom section squeeze button was not unlocking. WD-40, cleaned the dirt, lubed the squeeze button, and now it's fine.
My friend on the other hand, takes his poles inside the shower with him. they get exposed to hot water, shampoo, soaps, and he lets them hang dry. The paint rusted within 2 years. He still uses them, but I wouldn't trust moving fast downhill and leaning my weight on suspcious rusted poles.
WD-40 stands for [W]ater [D]isplacement, 40th formula. Jokingly, it's referred to as [W]et & [D]ry.
As stated by someone earlier, wipe down excess WD-40 lubricant with a dry towel. otherwise the goo will attract dust and dirt, that's the primary problem you are trying to correct.