The SCRUB-IT is a hand-held scrubbing tool that uses the leverage of the back of your hand to clean glass from contaminants or adhesive residue. The SCRUB-IT allows you to use your hand to reach in most places and scrub evenly throughout. Scrub-It is a one size fits all as it can be adjusted to all hand sizes with the attached Velcro strap. The Blue Scrub-It (GT2120B) comes with a Blue color scrub pad that is more aggressive and used for removing adhesive from the glass. *Please make sure to check newer vehicles for factory coatings that are applied to the inside of the glass that might be damaged by the Scrub-It.