I've had vipers come to my door a few rednecks in the garden and a couple of months ago king cobras all up necks out and growling which is the only time I got scared so asked around naugbours and was told vinegar so bought a few bottles very cheap and sprayed all around I don't know if it was the vinegar or me scaring the cobra but I've not seen anything now for months, even them horrible( ta carb) giant centipedes, vinegars worth a try its cheapest option