Instruct: Classify the given Amazon review as either positive or negative.
Query: Litter sticks to box sides

I had to get a scooper and scrape the litter off of the side of the box to get it to go into the container in more than one place or bang on the outside to get it to release. The screen also collected small amounts of clumps on the other side and piled up. I did not like this product, returned it.