Pesticide Free Cat Spot On Treatment That Lasts For 4 Weeks. Dimethicone Based. For cats and kittens from 12 weeks old. Bob Martin Clear Spot On is the extremely safe, simple and effective way to treat and prevent flea infestation on your Cat or Kitten. Each treatment of this easy to apply, odourless solution helps to repel fleas from your cat. In addition to this flea treatment you may require an additional household spray to combat fleas which may not have yet hatched or dormant fleas in and around the house. Please click here to see the range of household sprays available. The king of pet protection has done it again: Bob Martin Clear Flea & Tick Spot On For Cats is as effective as they come and on sale now at OnBuy!