Instruct: Classify a review into positive or negative sentiment.
Query: WILL NOT WASH OFF PORCELAIN!!! DO NOT BUY!!!!!!

My 5 year old loves to draw, so we were so excited to get these bathtub crayons. The first night he used them, he drew on the tiles on the wall around the bathtub. After his bath I went to remove the crayon from the tiles, and it was not easy, it took a lot of elbow grease. Tonight, he drew under the water on the porcelain tub itself, AND IT WILL NOT COME OFF. First I tried spraying Clorox Green Works and rubbing it with a rag. That had no effect, so I tried spraying it with Krud Kutter and scrubbing it with a large scouring tool. IT STILL WON"T COME OFF!!!!! In the morning I'm going to have to contact Crayola and see if they can think of something to get this off our bathtub. But these "bathtub" crayons are going in the trash and I will never buy them again!