Product review (5 stars): Cover Rusty Dishwasher Prong Tips and Stop Flatware Stains with These
I have an older dishwasher with rusting at the tops of several prongs on the lower rack. Normally not that big a deal, but it got to the point that little pieces of rust were flaking off, getting thrown around by the dishwasher and leaving rust stains on our stainless flatware/silverware. A new rack was over $100, so I got these instead.  125 was way more than I needed, but it wasn't a very expensive item. With a little bit of adhesive bathroom caulk (not included) on each of the rusty tips, these caps slid on smoothly and set securely after waiting overnight. The dishwasher still runs great but I'm no longer getting those rust spots on the knives, forks and spoons (and other stainless steel items I was in the dishwasher). It may not be a permanent fix, but it should extend the life of the rack until I decide to buy a new dishwasher.