2x OMO Ultimate Laundry Detergent Washing Powder 5kg $65 ($57 S&S) Delivered @ Amazon AU

With the buy 2 $15.00 off at 20 washes per Kg, it works out to a very decent $0.33c per wash.

Good for Front and Top loaders.

This is also currently rated as Choice Magazine’s #1 laundry powder at 86%.