I used this product to scrub both the inside and outside of many large windows with soap and water. I then used a squeegee to wipe off the excess cleaner. The product works as promised. It seems to be one tool in a group of interchangeable tools for cleaning windows, etc. It does seem a little pricey for what it is, which is essentially a fiber cover over a plastic handle. The cover is held on by a Velcro strap.