Swiffer WetJet - (read the letter)
  It has come to our attention that some people are worried about the cleaning fluid used in the Wet Jets or cleaning pads. We checked the sale of Swiffers at amazon.com, and found a warning to keep out of reach of children and pets, and in the liquid or undiluted form can be dangerous. Keep in mind that most cleaning products have this label. So here's how we solved the true mystery. We went right to swiffer.com and checked their FAQ page. Lo and behold, the answer was there, and now it's here.
  This text is copied directly from swiffer.com and is not meant to represent Ruling Cats and Dogs in any way.
Question
  "Is Swiffer safe for animals? What if my pet licks the floor?"
Answer
  "Great news for you and your pets! Swiffer Wet and Swiffer WetJet are specially designed to not leave a residue on the floor, so there's no need to rinse. We suggest you make sure the floor is completely dry before letting your pet walk on it, though, because wet floors can be slippery. Since there isn't a residue, there are no problems if your pet licks the floor.
   No more worrying about the owner of those muddy paw prints. You can enjoy the convenience of our Swiffer products without any worries for your pet's safety. "
  It seems to us that the Swiffer WetJet is less dangerous than a lot of the other cleaning fluids used on many areas that a pet can reach, like the bathroom, mirrors, or so on. You should also check some of the ingredients in your other products or see if they leave a residue.