How To Stop Cats Scratching At Wooden Furniture by How To Stop Cats Scratching At Wooden Furniture Mix three drops of tea tree oil and some grated lemon with half a regular glass of warm water. Add some balls of cotton wool and let cool in the fridge overnight. Once fully chilled remove cotton balls, use the cotton wool to wipe over any wooden things that the cats have access to and it the scent will repel them! :-)