From Page 6 of User Manual:
IMPORTANT: Over-moistening cotton swab may result in liquid entering instrument, which may result in damage.
Weekly cleaning instruction:
- Swab all areas of sample station with a lint-free cotton swab moistened with a 10% bleach to water solution (or 70/30 Isopropyl Alcohol solution).
- Swab all areas of sample station using a cotton swab moistened with water.
Note: Instrument use in dirty/dusty conditions may require more frequent cleaning.