WOW - 900 plants is awfully ambitious. Pissin around your plants won't keep deer away.You'd have to have a hell of a set of kidneys to piss enough to keep anything away from 900 plants. A fence or your 45 is the only thing that will keep deer from eating them. Soap & hair draws other critters & repellents, that are pretty questionable to begin with, have to be reapplied every time it rains.