My greatest fear when visiting Asia is snakes, not helped by being just missed by a Burmese Krait on a visit to Bagan. I was sent this recipe for snake repellent , maybe its of use to you chaps that live in Asia.
120 ml Oil of Cloves
20 ml Eucalyptus oil
20 ml Tea tree Oil
20 ml Lavender Oil
20 ml Sandalwood Oil
Dilute to one litre of water, respray every month.
It comes from Allan Burnett at Reptile Awareness Displays of Australia. Good friend of mine me tells it keeps them out of his yard.