I'll repeat that I am not in medical...and anything I offer is from industrial and microelectronics and does not include any bioburden requirements.
It's results that matter for cleanrooms, not methods. IF you reuse the mopheads 10x...do you still get acceptable results?
We used the same mops we used in the cafeteria and office, and changed them out when they didn't leave the floor visually clean anymore.
Standard practice is WAY overkill from what I've seen....
For my rooms, they were measured by count in the air...we paid attention to count in the air. Mopheads did not contribute to this, and we did not process our materials on the floor.