Product review (4 stars): A much needed modification addition to your dishwasher racks
The ends of my Whirlpool portable dishwasher were starting to wear off leaving them open to rust.  Ive read that if you do have some rust on your dishwasher rack you can use a mixture of lemon and baking soda to remove it.  These tips fit the dishwasher.  I don't know why dishwashers don't come with these tips.  There were enough tips to cover the bottom rack and top rack with about 10 to spare.  They are like what other reviews mentioned, a pain to get on.  I found just rotating the tip while pushing down hard will do the job.  Another suggestion is grab a beer throw on some music and plan to spend next 45 min doing this monotonous task.