Hello. We have an AEG dishwasher. After about half a year, washing does not work as it should. Plates and cutlery are not perfectly washed, leaving pieces of food or smudges of food and grease on them. The dishwasher stinks. When we tried to clean it with a cleaner from LIDL that has such a wax stopper , nothing happened and the stopper stayed where it is. We've already changed the contents ... nothing works. Thanks for advice