Product review (5 stars): Spend 10 bucks or so and your dishwasher is good to go!
Here's the deal.  For months my wife had been telling me that the racks (particularly the lower one) on the dishwasher were rusting.  By the time I actually got around to look at it there was  serious rust on many spots and some of the places had rusted through and broken off and there was rust falling into the dishwasher where the dishes are.  Not good!  I investigated the possibility of buying a new rack but, Whoa!!  They wanted $150 to $200 so that was unlikely.  When I Googled "repair rusty dishwasher rack"  one result was ReRack at Amazon.  I bought it for about 10 bucks.  I followed the instructions using a small wire brush to removed as much rust as a could and then a file.  I had to actually break off and discard a few of the areas but there is enough places left to load the dishes.  I waited about 3 days and then ran the dishwasher.  None of the material washed away, cracked, melted or fell off.  I have now been using it for about 4 weeks and all is well.  No rust!  Even if I had to do the procedure again every few months at 10 bucks a pop that is better than spending $150 on a new rack for a 12 year old dishwasher that my blow up tomorrow.  I highly recomment ReRack.