I received shamwow as a gift. I use it to wipe down my car after I wash it and as a bathmat. Occassionally I use it on furniture. I keep the instructions with the shamwows to make sure I follow the instructions that come with it. However, they do not work on glass and mirrors. It leaves a film on the glass that has to be cleaned again with a clean cloth. I even tried different window cleaners and got the same result each time. I would not tell anyone to buy this product.
Thank you for your time.