This one has been widely circulated down here, and if I recall correctly, was originally supplied by the son of a resident. ( I think the son was with CSIRO or somesuch )
Any way, I use it, and generally it gives 3-4 days of protection. If the seasonal conditions are blowing new mozzies in all the time, it is not as successful.
Applied with a pressure sprayer in low wind conditions, and sprayed over plants, and into dark areas. I understand it also deters the millipedes.
Per 1 litre of water
30ml of Bruinings ant & spider killer ( look for a product with a lot of Pyrethrin if you can't find this one, as that is pretty much all that is in this product )
20ml of Seasol ( liquid seaweed extract concentrate )
20ml of wettasoil ( a liquid wetting agent )
Use a mask, not nice if you breathe this stuff in. Over here, you can buy all of this stuff at Bunnings.

