Having read through most all of this thread I am surprised no one appears to have mentioned Optimum ONR. While I don’t know the price in Australia here in the States it is extremely cost effective if you want to limit your products overall and costs.
It is one of the only products I know that is advertised by the manufacturer and proven to be used as a car wash, window cleaner, interior cleaner, QD, clay lube, basically almost all car cleaning tasks.
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