From page 18 of the User Manual:
The DNAble Reader Instrument can be cleaned using a lint-free wipe, damp with Isopropyl Alcohol (IPA). Avoid using free liquids to clean the device.
To clean the wells of the DNAble Reader, we advise the use of a foam tip swab such as Chemtronics Foamtips (Product Number CF4050). Dip the foam tip swab into the isopropyl alcohol and allow any excess fluid to flow off the swab. Insert the swab into the instrument well and circle the tube wall.