There are some commercial car wax removers - you can Google them - or just use a dishwashing detergent. Usually people quote the
Dawn brand detergent in car detailing forums but I'm not sure if that's available in Aus - any regular brand should do. You dilute it in water, of course!
If it's still too stiff once the wax is removed, try a 'solid' teflon lubricating stick instead as it can be applied more sparingly than car wax, e.g.
Goss Dri Lube.