After thoroughly cleaning the racks of leftover burnt food, grease deposits & rust, you need to wash them. Dissolve dishwashing liquid in a tub full of hot water & make a foamy solution. Now soak the racks in it. It will help remove any remnants of WD-40 MUP and other impurities left behind. Like any other cleaner, WD-40 can contaminate food & therefore, you need to remove it thoroughly from the racks. Before you proceed with drying the racks, please ensure that you have thoroughly cleaned all the excess WD-40 product from the grill racks. Now rinse the racks with clean water.