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Thank you all for your answers! I will definitely try the citrus and eucalyptus oils and give the worktop a good wash down with bio washing liquid. The toms are owned by neighbours-goodness knows why anyone would want an un-neutered male as a housecat-they get injured in fights, run over on the roads and have shorter lives in general. We are pretty sure it's not any of our chaps doing the pee-wrongly or not, some of them are fed on the worktop and a cat will not desecrate it's own feeding place. Anyway, I will give all your suggestions a try-thanks again everyone! Maz x