1. A method of determining a laundry load fabric type in a clothes washing machine having a treating chamber containing an un-wetted laundry load, a rotatable laundry mover, and a motor operably coupled to the rotatable laundry mover, the method comprising: prior to wetting of the laundry load, applying a perturbation force to the un-wetted laundry load in the treating chamber by rotating the laundry mover with the motor; determining, by a controller, a response to the perturbation force during the rotating of the laundry mover; and determining, by the controller, the laundry load fabric type based on the determined response; and selectively providing a liquid to the treating chamber based on the determined laundry load fabric type.