Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Unsanitary

When I first purchased this mug, I was very pleased: it didn't leak or drip and an added bonus -- it actually kept the coffee hot, not just warm. However, I realized that it was quite difficult to clean, especially if it sat empty in my car all day. I purchased a baby bottle nipple brush to try to get inside the spout (actually I tried two different nipple brushes) and really wasn't too pleased. I soaked the lid at night and did the best I could. Then one morning as I was traveling at 65 mph along the interstate, I took a sip of coffee. As I was returning the mug to the cup holder next to me, I glanced down and saw little tiny somethings on the top of my mug. Because I was driving, I could only glance and I thought I detected that the little tiny somethings were moving. When I stopped and was able to take a good look I realized that the little tiny somethings were some kind of worms..YUK. The mug was a breeding ground for maggots. DISGUSTING! It went in the garbage!