The fingerprint sensor on the CT72 is in constant human contact and tends to accumulate dust, grime and other foreign particles on the scanning device. With extensive usage, like any other electronic device a fingerprint sensor can get damaged. Using industry solvents to wipe the device can harm the sensitive surface of the sensor. There can be a decrease in the capture sensitivity of the sensor that may lead to failure of recognition of fingerprints.
To clean the scanning surface, apply a piece of scotch tape and peel it off gently, it should remove any traces of dirt or dust from the sensor surface. If the scanner is very grimy or cloudy due to heavy usage, use a lint-free cloth or a cotton swab dabbed in mild ammonia based cleaner, rub it gently across the surface of the scanner and blot the surface dry. Do not use paper products to wipe the sensor surface and do not pour or spray any cleaner directly on the sensor. It is recommended that hands should be clean before using the CT72 fingerprint sensor. Measures should be taken not to touch the surface with fingernails and sharp or rough objects.