As I understand it cats have a fairly good memory. They will go and use a particular area to do their business in on regular occasions. However this is an area they feel comfortable in, so if you make it uncomfortable for them they will not use it and hopefully remember this and not return for some time.
When I find cat crap on the lawn the first thing I do is send it back to where it came from. I then use one of the sonics for a few weeks. It annoys the neighbours but keeps my lawn crap free!! After a period of a few weeks you should be able to remove it (or move it to another location around the garden).
If you want the following products are all known to be hated by cats: Citrus (lemon juice is good), pepper, lion poo, mothballs (cheap alternative) and other various scented stuff such as special plants.
However nothing works better than you catching the cat in action and lobbing something at it!! Even if the cat isn't wholly deterred you feel a lot better.
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