We, along with the manufacturers, advise that all underwired garments are hand washed. Machine washing can shrink the delicate fabrics and can also misshape the wires, even causing them to pop through. This can also lead to considerable and costly damage to your machine.
Using warm water - not hot as this can grey your whites - a drop of Soak (as pictured above) gently wash your delicates and swimwear by hand. Do not use fabric conditioner as this breaks down lycra and always rinse swimwear in cold water after use.
Dry your lingerie and swimwear away from direct heat, as this can again damage those delicate fabrics, embroidery, lycra and lace.