Brother GT-541 Instruction Manual page 74

6. Maintenance
(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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Wiper Cleaner
GT-541