Check transports accumulate dirt from the pollutants in the environment and by being handled. This dirt collects and clouds the optical lenses inside which are the most critical component of the transport. These optics allow the imaged check to become a legal document for check clearing as stated in the Check 21 law. The ability of the transport to properly create the image is why the optics are the most critical component of the transport.Canon CR-25, CR-55, CR-135i, CR-180, CR-180II and CR-190 Check Transport Cleaning Card with Waffletechnologywere developed to clean the transport"s optics of built up dirt and ink. In addition, it will also clean thetransport roller mechanisms that allow the check to pass through the scanner. This card, when used as a consistent maintenance product, will keep your Canon Check Transport Units performing as designed. Available in Boxes of 15 Cleaning CardsCanon CR-25, CR-55, CR-180 and CR-180II Check Transport Cleaning Card with Waffletechnology is an approved product by Canon. This product was developed and tested to be an effective means of maintaining this equipment through a joint development project between Canon and the engineers at Waffletechnology®