I am assuming the indoor/outdoor carpet is outside ;-) If it's inside I certainly wouldn't recommend hosing it down! I don't say that to be mean to kffrmw88 but because a year or so ago someone asked a question of what to do after actually having used a hose to rinse their carpet indoors :-o
Anyway, ammonia is not such a good idea. Perhaps you could rent or borrow a steam carpet cleaner?
Wash your carpet with gentle detergent and lukewarm water. Rinse by hosing it off. Here are specific problems and how to treat them: Oil - Olefin tends to collect oil and can become dingy, so spot clean with dish-washing detergent solution and scrub brush, rinse and dry. Good luck.
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