The school cafeteria I worked in had this (was a middle school that also prepared food for some smaller elementaries). We put plastic foodservice containers in

The school cafeteria I worked in had this (was a middle school that also prepared food for some smaller elementaries). We put plastic foodservice containers in there all the time. As long as the plastic is made to stand the heat of the water, you are usually OK. Home dishwashers have similar restraints.