So - bottom line: signed GenDec + 2 empty cans of insecticide and you're home free.
Is that really the case? I heard that a Residual Disinsection Certificate was the ONLY thing accepted in Italy at the moment - ie, Disinsection not permitted to be performed by crew and must be professionally applied. A Residual Disinsection is valid for 8 weeks. Correct me if wrong, please.