Their recent suggestion mentions using the spray lubricant WD40 to help clean off water marks, fingerprints and stubborn marks from your stainless steel. Not only will it clean things up in a snap, it also further protects the surface from gaining these marks again. Will you have to do it again down the road? Sure, but not as frequently as other products made specifically for the purpose will!
NOTE: As readers have pointed out below, WD40 is petroleum based product so it's important to consider food and health safety if using in the kitchen. The tip from This Old House was for use in the sink and advised to clean the sink off well after use.
Image: Ian Spanier for This Old House