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I'm up in an area heavily populated with deer. My experiences have been that liquid fence, coyote urine, and human urine have poor results in keeping deer from browsing gardens.
Sprinklers, dogs in the area, and other less-than-lethal means of hazing are not overly effective around here.
In my area, tall fencing is the only truly effective means of protecting a garden.
8 foot tall fencing seem to keep out lazy deer that have good food sources elsewhere nearby. If the deer are hungry, 8 foot fencing is not going to get the job done. Most deer here can clear that without much problem if they want to.
10 foot tall fencing is starting to get to where you need to be and will work pretty well but is not 100% effective.
Around here, you need 12 foot tall fencing at a minimum for successful, reliable exclusion. The deer are amazing at their intrusion skills when they really want to get to food.
The nice thing about fencing is once it is up, your deer exclusion work is done, unlike the chemical deterrents. You don't need to hurry out to your garden after each rainstorm to reapply your fence.
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