Ultimate All Fiber Rinse drops the pH, more acidic (does NOT clog lines as this is a liquid!), has extraction emulsifiers, has cleaning ability, synergistic with TMF Presprays, leaves carpets soft with no sticky residue, more concentrated, prevents resoiling and safer than competing rinses out there. It took our chemist many months to perfect, so if you're tired of the older formulas out there downgrading your current carpet cleaning presprays then look no further! Ultimate Fiber Rinse does many things such as prevents browning, prevents yellowing, stabilizes colors, boosts cleaning and it is 100% free rinsing! This also has our citrus lush essential scent!