The working principle of a washing machine is

A washing machine primarily removes water from wet clothes by rapidly rotating the drum so that the contents experience an outward (centrifugal) force; this forces water out of the fabric toward the drum walls where it is drained — i.e., the machine uses the principle of centrifugation during the spin cycle. Centrifugation separates components by applying radial acceleration so denser or liquid portions move outward and can be collected or removed. By contrast, dialysis, reverse osmosis and diffusion are membrane- or gradient-driven separation processes (relying on selective permeation or concentration gradients) and are not the mechanisms used to extract water from laundry in standard washing-machine spin cycles.