Slightly ashamed to have reached the age of 31 and not have figured this out yet. 
How do you clean your mop after using it? Especially if you use it with one of these "squirt and mop" floor cleaning products that don't require a water bucket?
I always feel like after the first use, I'm just going to be spreading the dirt around the floor again. Dust, cat hair, bits of food etc. And is it ever acceptable to use the same mop in the bathroom and kitchen? I have a downstairs bathroom off the kitchen so the floor area is all one long area.