Yep. When I was looking for safe ways to keep the kangaroos away, nearly everything I found referenced possums and the garlic water was one of them. I used the garlic first but found I had to reapply it so frequently due to reticulation, whereas the poss off seemed to last longer until the kangas just seem to now stay away from the rose beds.

The best deterrent I found was references to sprinkling either dingo faeces or tiger urine around the perimeter. Still looking for a willing tiger to help me out with that one!!

ETA: Should have said you need to let the garlic water "brew" overnight before using it.