Irish Spring and a cheese grater. Apparently squirrels hate the smell of the soap, so they'll stay out of your garden. as well as deer and mice. Rather than grate it, I cut chunks of Irish Spring soap.
squirrel remover - Irish spring whole or grated - One person commented: We tried this last summer in our vegetable garden. After hanging a few bars around the perimeter, no squirrel in the garden and drilled a hole in each bar and hung it on some hooks
Homemade Squirrel Repellent: Keeping Squirrels Out Naturally and Safely