What do you mean it only allows for a 1 detergent wash?
Jerrod, if you will go pull up an owners manual for a current Bosch dishwasher, most likely you will see it only has provisions for one detergent dispenser. That's quite common in european dishwashers. From what I've understood, it's actually not needed to a 2 cup dispenser. It's extremely rare I use the pre-wash cup on my Kenmore Elite, I find it's not needed. and you know how I BobLoad. Besides, it might be a little bit much in the opposite direction, but I'd rather the machine have food residue left for the main wash so that the detergent eats away at the food and not my racks or seals in the machine. I've never had racks wear out in any dishwasher I've owned and I've owned two thus far. The Kenmore is my 3rd. The Hotpoint that came with the house doesn't count since it was so pathetic, it didn't stay in the house for just under 3 years and I lived with it for 16 months.