Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dont buy this mug

I loved this mug for over a year, because it does seal up very nice, so I can toss it in my bag and not worry about it leaking if any coffee is still in there. Recently the coffee has not been coming out very good, seemed to be blocked. I did everything I could to clean it, but nothing helped. I then used a small wire brush for cleaning baby bottle to go in the spout. Then I added water, closed the top and started shacking it over sink to get water out. A large piece of mold came out. I was disgusted. knowing I would never use it again after that, i broke of the bottom piece that seals it, and it was disgusting. full of mold. You can really clean in there, so please stay away from this mug.