Instruct: Classify Amazon reviews into positive or negative sentiment
Query: To hard to clean.

IT is hard to get this clean. You can soak it, but then it's hard to get it dry. Since it is plastic, I don't want to put it in the oven. Also my dogs (Blue heeler mix, Miniature poodle/cocker mix) don't enjoy it was much as the Kong toy. I think that's because the Kong's movements are wobbly and more erratic--more like prey. This cube just clunks over and they lose interest.