How to clean the BR1900 wiper blade?

If the wiper blade is dirty after working a period of time, the ink will diffuse and there maybe some smudges on the image printed,and now you have to clean it manually.

1.Firstly, move the carriage to the position and remove the cover as Figure 1 shows.And you could see the cleaning unit as Figure 2 shows.

2. From the back of the flatbed printer, you would see some gears as Figure 3, Turn them to lift up the wiper blade like Figure 4.

3. Now you could start wiping it with cleaning liquid like Figure 5.