A good remedy to keep fleas off of your cat is this simple solution: Slice a whole lemon very thin (peel 'n all) and add to a pint of water. Heat this mixture right until the boiling point. Let sit overnight. In the morning gently rub the mixture into your cats fur and skin. Just dampen the fur don't drench it! Do this once a month. This is a natural flea killer! You can also use this every day for skin problems involving fleas.