How much chalk are you applying? If you are fiendishly grinding your cue into the chalk like a screwdriver like most pool players do, then what is there to wonder about staining the shaft? I agree with Lisa here. Chalk modestly and regularly wipe your hands and shaft in between frames. A lightly damp cotton face cloth is all you need. My cue is oiled ash which is porous and highly susceptable to blueing, but it isn't stained one bit.
I'm not over-chalking or anything. I've seen people try to start a fire inside the cube... It's ridiculous... and a waste of chalk.
It's not that my shafts are stained. Currently, they look great! I've been using nothing but tan chalk ever since I started with some nicer equipment and would like to switch to blue. I just want to make sure that my shafts continue looking great.
My main objective from this thread was to find out if bluing of the shaft was inevitable (no matter how much care you take) when using blue chalk. I see that this is not the case.
It looks like I will be continuing with the Qwiz and adding a magic eraser and a couple of cotton cloths to the case. Hopefully I can find a place to pick up some Blue Diamond this weekend.