Lenovo T1 User Manual page 19

Routine maintenance
Note:
It is recommended to replace the filter every 3-6 weeks.
Mop
(Cleaning after each use is recommended)
1.Remove the mop from the mopping module.
6.Fill the dust box with clean water, close and shake it,
then pour out the dirty water inside. Repeat this step
several times until the dust box is cleaned up.
2.Clean mop and air it
Note:
to avoid backfilling of dirty water that would clog
the filter element.
It is recommended to replace the mop every 6-12