“What is the material composition of the rack for this model? For the Model WDF530PAYM is the rack made of nylon through and through or is it wire with nylon over it? One salesperson recently toId me that some racks are made of all-nylon material but another salesperson has told me that this model and all models have wire under the nylon. The first salesperson says the all-nylon (no wire underneath) is made to prevent rusting. This made sense as the dishwasher we have now causes rust spots on edges of dishes because the nylon (or maybe it's vinyl) has worn away. So what is the rack made of for this one? Thanks”