In New Zealand...
Let your handler know that you require to spray on arrival. Usually MAF the local authority for Agriculture and Fisheries will meet the aircraft on arrival, as well as a NZ Customs officer.
When you park up and shut down.. do not open the doors or DV windows until told to by the handler / MAF officer. Might pay to keep the APU running.
The MAF officer will then come on-board and spray the cabin and the luggage hold. This is the Permethrin spray. They will NOT accept aircrew having sprayed at Top of Descent, unless you have undergone accreditation with MAF. They also will NOT accept aircrew spraying infront of them on the ground.. They have to do it themselves..
You'll have to stew in the spray for 5 minutes.. then they'll clear you to open doors..
Australia from memory was much the same with their Agriculture officers and customs officers meeting you on arrival. However they may let you spray without them coming onboard. More often that not, they will have a supply of the spray or the handler will..
The residual spray your talking about is applied every 3 months by a specialist.. It's pretty expensive and is only good if your going to be going in and out of Australia and New Zealand all the time. It's just cheaper to spray on arrival.