That washes, in various senses of the verb. Of a garment, a textile fabric: That will ‘wash’ or admit of being washed without injury to colour or…

That can be washed without damage to texture or colour.

Of garments, etc.: washable in a tub; suitable for laundering in a tub or (domestic) washing-machine.

Capable of forming soap-suds; also of garments: washable in soapy water.

Able to be washed in a washing machine.