Cat litter or some of that sand-like stuff that's specially made for cleaning up spills should take care of it. Seriously, you can only clean it up where you can get to it. If it's made its way into some small nook that you can't reach, you'll just have to let it go.
It's not a huge concern for animals because it's not on the ground. As long as you don't have entire puddles of the stuff laying around for a dog/cat to lap up, you should be fine.