Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ok on flat surfaces...

I purchased this a couple of years ago after I had surgery and could not bend and reach for a long time. It is fine on flat, straight surfaces, such as shower walls, however it does not work well on the curves of a bath tub. What bugs me the most is that the bristle brush comes loose from the pole and I have to constantly screw it back on. This makes it too frustrating for me to use!