This video shows how to remove extra foam from a dishwasher that is caused by a misusage. Usually, wrong types of detergents find their way into the dishwasher from prewashing. To clean the machine from foam, empty the tank and rinse the wash area and all parts carefully. After this, just run the empty dishwasher twice with washing program.
In case the machine still keeps producing too much foam, you can boost its removal with vinegar. Dose half a liter of vinegar into machine’s washing tank and run the empty dishwasher twice with washing program.