SAKURABlue Medium Point Solid Marker

I wanted something to mark the plastic food & drink containers for my 2-year old when he takes them to Nursery.Bought this (and another in different size/colour) since they stated they could withstand the temperatures that my dishwasher operates at. Sadly they might be good at the temperature, but the combined action of the detergent & hot water in the dishwasher removes the markings after two washes.I took a gamble on these; they don't market themselves as dishwasher-proof so I'm not complaining - just posting this in case someone else is thinking of marking items that go into the dishwasher.