Half full bottles of water will stop them using the garden as a toilet. As for the cat's scratching the car I can't really comment as my cat is forever sitting on my car. He even likes going for drives. In the 8 years the worst he's done is left dirty prints on the windscreen.
![[Image: johnl_zps418f4568.jpg]](http://i1054.photobucket.com/albums/s497/Lewis6317/Sigs/johnl_zps418f4568.jpg)

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