The smell is coming from stagnant water and debris left in the internal plumbing and dirty tank. You need to do a rinse cycle and let everything dry completely.
- Empty and rinse the dirty water tank immediately after every use.
- Fill the clean water tank with plain hot tap water only—no cleaning solution.
- Run the machine over a hard floor for 2-3 minutes to flush the solution lines and brush roll.
- Empty the dirty tank again and rinse it.
- Remove the brush roll and filter (if equipped). Rinse them and let them air dry completely.
- Leave the empty clean water tank lid open and store the machine in a dry area.
HEADS UP: Never store the machine with liquid in any tank. Always complete a rinse cycle after using cleaning formula to prevent mildew and odors in the internal system.