Siemens is offering a 30-day money-back guarantee on its i-Dos washing machine WM14S890GB. If customers are not satisfied with the wash after using it for 30 days, Siemens will take the machine away and give a full refund. At the end of the 30-day trial, customers who keep the machine will receive a 12-month supply of washing detergent and fabric conditioner absolutely free.