Brother GT-782 Instruction Manual page 80

6. Maintenance
(6) If the ink inside of the Wiper Cleaner Cassette is soiled with ink:
Wear gloves and remove the ink with a dry cloth, and then clean with a moist cloth.
(7) Push both sides of the Wiper Cleaner Cassette to open it.
(8) Carefully drop off the used Wiper Cleaner and dispose of in accordance with local regulations.
<Note>
Dispose the used Wiper Cleaner in compliance with your local regulations.
(9) Insert the two projections of the Wiper Cleaner Cassette into the holes on the new Wiper Cleaner.
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Inside the Wiper Cleaner Cassette
Wiper Cleaner
GT-78２