Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Cool gadget but stains over time, hard to clean

I've had two of these over the years since discovering them. They make a world of difference to get a deep bath for a bigger person. I travel with this too. But over time, and not very long, they discolor and get way funky with scum, then are very hard to get clean. I scrub, I run it through the dishwasher, but it never again comes crystal clear like new. So if you care about that, plan to replace it at least every year.