Product review (1 stars): Rusts on the inside; stains on the outside
Two years after purchasing Bosch's "stainless" steel "rust-free" dishwasher with a "lifetime warranty" against rust, we discovered... rust. It was in a very specific area, where the metal filter attaches to the interior tub. We called Bosch and were told that it was our fault, that it was our water, our dishwasher soap, our flatware--anything but the dishwasher. We persisted, explaining that we use a water softener and a reverse-osmosis system and that our water is no worse, and probably a bit better, than average. Furthermore, if it was merely our water, then we would expect to see rust everywhere. As for our dishwasher soap--well--it comes from Costco, and I'm sure they'd take exception to Bosch's claim that it promotes rust.

We offered our own theory, which is that the metal used in the filter is dissimilar to the metal in the tub, resulting in a galvanic reaction and corrosion to the metals. Basically, the two different metals, pressed together in an aqueous environment, results in a battery. But for Bosch to admit this would be to admit a design flaw--the sort of admission that leads to a class-action lawsuit. We already know Bosch uses a variety of "stainless" metals. For example, the metal used on the door is a very inferior grade of stainless steel that is easily streaked and spotted. And the way you can tell is to use a magnet. If the magnet sticks then it's ferrous metal and more prone to staining.

Bosch advertises a "lifetime rust-free warranty" on many of their dishwashers. This section is taken right out of the manual: "Stainless Steel TallTub: A rust-free, hygienic interior surface with a lifetime warranty."

Yet if you attempt to exercise your warranty, Bosch will tell you that they don't actually guarantee their metals against rust; they only warrant against "rust-through", meaning you will have to live with the rust until it eats a hole through the metal--until water starts pouring into some part of the dishwasher where it doesn't belong (hopefully not endangering you, your family, or your home, in the process). It is fraudulent of Bosch to advertise a "lifetime rust-free warranty" if they have no intentions of honoring what they advertise.