My Zanussi Jetsytem Progress 1600 is not washing properly - washing smells?

Recently, we noticed our washing is smelling uncleaned.

I have cleaned the tray where the washing liquid goes in and it still smell.

I had a looked at the filter and that is relatively clean.


I have done a few empty washing to clean it but it is still smelling. Not sure if this machine heats the water up or it uses the hot water pipe for washing.


Can you tell me what could be making our washing machine smell. It is smelling even when it is not being used?