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To stop outdoor cats from marking your belongings, you must first clean them with more than plain soap and water. You will need to use an enzymatic cleaner or one of the formulas from Litter Box Blues:Odor Removers.
Next treat the area with a citrus scented solution. Cats don't like the smell of lemons, limes, oranges, grapefruits or tangerines. You can use a potpourri oil, fruit rinds/peels, or even citrus scented cleaners.
This citrus scented solution must be re-applied after rain, and/or the scent disipates.