I have one those electronic cat scaring alarms. Costs about a tenner or something and runs on two of those little PP3 9V batteries - they last about a month. Cats absolutely cannot stand the thing. We have a number of cat lovers in our street that each seem to have a few of the buggers.
The area where I park my car used to be infested with them, they would be over the gates, walls, fences, cars and often you would often see half a dozen sat in the road behind my car waiting for the owners to get home and give them some food.
Now its like a ghost town, and its rare to see a single cat!!!! In fact I cant remember the last time I saw one! It took a week or so after I installed the device for them all to get the message and learn not to come within a 25m radius of my car. During that time we chased and sprayed everyone we saw with a super soaker, plus sprinkled pepper around and on the walls just to make the area really unpleasent for them.
I used to have paw prints and scratches on my car every time I went to it, it hasnt been climbed on since I installed the device in February!
