I always rinse the soiled plates before putting the machine on. The wash tablet is left in the machine when it has finished.
Sometimes the top shelf doesn't even get washed. I have used a dishwasher cleaner and I clean the filters out every month. What else should I be doing? I do not know the model number, sorry!

Gill, July 2007

Have you tried using a liquid? We get a similar problem when we use powders.

Colin, August 2007