Brother GT-541 Basic Operation Manual page 47

5. Maintenance
(9) Push the both sides of the Wiper Cleaner Cassette to open it.
(10) Carefully drop off the used Wiper Cleaner in a trash can/bag by turning it upside down.
<Note>
Dispose the used Wiper Cleaner in compliance with your local regulations.
(11) Insert the two projections of the Wiper Cleaner Cassette into the holes on the new Wiper Cleaner.
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Wiper Cleaner
GT-541