This organic pesticide won’t kill all the bugs in your garden, but may annoy them enough so that they move over to your neighbour’s.  I personally think that if you don’t want to use any chemicals in your garden, you need to arrange your plants carefully, to exploit the fact that certain plants naturally repel various insects.  This can help too, but from experience, you do need to spray often as this product isn’t deadly, but just mildly annoying.

Make an All-Purpose Organic Pesticide from Vegetables [link]