My tineco S5 floor washer comes with a "Self Clean" function which the floor washer would be able to self clean its brush roller.
To do this, follow the steps below:
1. Fill the clean water tank
2. Empty the dirty water tank
3. Put the floor washer on the charging base
4. Press the "Self Clean" button
5. The tineco floor washer should start self cleaning now. Wait for around 2 minutes for the cleaning cycle to complete.
6. After the cleaning is completed, remove and clean the dirty water tank