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Thank you all for the answers, and yes Daffy, I watched the cat !! Left to me I would clean it up and leave well alone, Mr Flump however really hates cats and is unreasonably stupid when it comes to them ' going' on our lawn. His ex wife had and still has a house full of cats left un-wormed and full of fleas and not let out so with 14 cats to use litter boxes he developed a dislike for cats. This spirals ridiculously when he spots one in our garden , or sitting on his car ! He would never hurt one, he is full of bluster, I would like to deter them to stop him banging on the window like a loon every time he spots one coming up our path !!