I have an extended warranty for my dishwasher from Sears.
The Bosch dishwasher worked great for the first year. After then, the dishwasher left particles on the dishes and on the interior walls of the dishwasher. The dishes weren't coming out too clean either and they had to be hand washed after they came out of the dishwasher.
I called Sears. A tech came out and they told me the dishwasher was working fine. I showed them some example dirty dishes and he told me I was adding too much soap. Another tech told me I needed to alternate between power soap and gel.
I greatly cut back on the soap but the dishes still came out dirty. I started washing the dishes by hand before putting them in the dishwasher. The dishes were coming out dirtier than when they went in.
After about a half dozen service calls and one technician who seemed to enjoy screaming at me I called up Sears and canceled the extended warranty of the dishwasher. While I was at it, I canceled 5 other extended warranties.
I searched for some answers on the Internet. I know the water is really hard here (I only drink bottled water) so I used CLR and ran it through the dishwasher and let it soak overnight.
Dishes still didn't come out clean. I took the dishwasher outlet hose off of the garbage disposal and ran the hose into a bucket at ground level to make sure that the water was being properly evacuated. Water was coming out forcefully.
I ran the dishwasher again with two bottles of CLR. I first scooped out the water from the dishwasher so that the CLR was barely diluted. I ran the dishwasher for awhile then paused it and let the CLR soak overnight. I drained and rinsed several times. Then I ran the dishwasher with a few cups of vinegar.
Dishes are now coming out spotlessly and I got back a few hundred dollars from Sears and won't pay a small fortune when I would have had to renew in a few months. And I won't have to deal with the screaming technician anymore.
Sears Extended Warranties used to be very good but since they've been bought out by K-Mart the service is now awful.