When it comes to Car Shipping from Australia, you’ll need to be sure that you make an effort to clean it up as best you can prior to shipping.
Your vehicle will be going through a quarantine inspection when it arrives in NZ, so you’ll have to try to make sure there is no biological matter (plant or animal material, grass clippings, seeds, leaves, animal hairs, bugs etc.) on your vehicle prior to shipping to ensure it has the best chance at passing that initial inspection. If any of this material is found on your vehicle during the inspection you will be charged for decontamination and reinspection.
Please also note that paying hundreds of dollars for a professional detail in Australia won’t guarantee a pass from NZ quarantine, so you are better off not spending too much money getting your vehicle cleaned in Australia and just taking the time to do you best to clean the vehicle yourself.