Its likely Deer, and soap will do NOTHING to deter them. (Neither will human hair, or urine, etc..these are all just popular myths) Either Liquid Fence or a real fence is the solution.

So far I have been trying a home made concoction. I mix up one beaten egg, a splash of milk or yogurt, one garlic clove minced and add about a half gallon of water. I let it sit for awhile and then water my plants with it outside. It stinks like wet dog hair to me, but so far it has been keeping the deer from eating my plants that I put it on. It must work because I had forgotten to put it on some lilies I have and they were chomped down to the ground!

The only downside is you have to reapply right after a rain. I don't take any chances and apply it every few days. I'm sick of deer and rabbits devouring all my plants year after year. I used to have 15 new roses, now after 7 years I have like 4, and some are rootstock. I can totally empathize how you feel!