Orange oil (d-limonene) has become a very successful “NATURAL” means of controlling a wide range of insect pests in USA
Unfortunately there are no commercial products currently available in Australia that have been registered for use as an insecticide.
There are a number of Orange-Oil based cleaners that might work, although care should be taken with regard to the strength of the product, as some have the ability to melt plastic and strip paint.
A home made Citrus Oil mix can be made by mixing citrus peel of any type in a blender and covering with cold water. Left to soak for a couple of days, the strained mix can be sprayed on a wide variety of insect pests such a cockroaches and ants.
Not as strong as the real thing, and expectations should not be for total eradication, but success to some degree should be achieved.