Generally most aircraft should have a residual disensection certificate... It lasts a few months I think, and it avoids crew having to go down the aisles with the spray.
For example, when VH-FNY was being used by Alliance, it did not have the residual dissensection, so every international flight it did (honiara/the one time it went to nlk carrying bits and pieces for FWI/when it went to dps and bkk) it had to have the spray in the cabin. This wasnt required on Hotel or India as they kept the residual up to date.
Dont know about cargo though, every arrival on NLK was met by a quarantine officer with a few spray cans.
The first thing they asked for on arrival at most ports was the gen dec and a residual dissensection declaration thingy.