Just some links of things I've researched for other people.

https://www.bigw.com.au/product/windex-outdoor-surface-glass-cleaner-750ml/p/352694/# Mentioned on the radio recently bit nobody else seems to stock it walk-in retail. Online $10 plus delivery (minimum 4 days!) for the 750ml currently, but available also at some of their retail stores (ring them to check price and availability).

The Windex site http://windex.com.au/ has a "contact us" button but it redirects to the USA site. My attempt to send a message was unsuccessful as I don't have a US State to give them as part of my postal address, and it's a required field!