Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It works very well

A truck I purchased had very bad spotting on the paint and glass. I took it to an autobody shop and detailer and they were able to get the paint back to new but neither of them were able to make much difference in the glass (their main 'trick' is using 000 steel wool which didn't work for me either).I did some research on the web and several users on auto Q&A; sites recommended spot-x. I couldn't see it working but I checked it on amazon and found a lot of very high reviews so I went ahead and purchased.I applied it as instructed and worked it hard. I got really good results. The glass sparkles and from several feet back it looks new.Only if I get right up on the glass at the right angle can I still see a little residue. I don't think anyone else would notice. But I might try the process again to see if I can get rid of even that.