If you get an Unable To Clean error on your Brother MFC-210, MFC-410CN, MFC-420CN, MFC-620CN or FAX-2440C it may be because the ink purge tank count has reached its “full” limit.
Brother Mfc 210c Machine Error 461
To reset the purge counter:

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- Enter machine maintenance mode (on MFC210C all four photo/copy/fax/scan lights flash in maintenance mode). Warning: care is needed in maintenance mode, otherwise critical settings may be inadvertently corrupted.
FAX models with numerical keypads: Press the Menu button, then press the following keys within two seconds: *, 2, 8, 6 and 4 keys (if you fail to complete the correct key sequence within two seconds, press the STOP key to try again).
Other (non-FAX) models: Press the Menu button and the Black Start key. Next press the “up arrow” key four times to enter the maintenance mode). - Press the 8 then 0 keys in the initial stage of the maintenance mode to call up the machine’s log information list (function code 80).
- Press the black Start key several times to scroll through the log information list to reach the purge counter. The purge counter is the 25th item in the list.
- Press the 2, 7, 8, and 3 keys (in this order) to reset the purge count to zero.
- Press the Stop/Exit key to return to the initial stage of the maintenance mode.
- Press the 9 key twice to return to the standby state.

Brother Mfc 210c Machine Error 46 Brother
Caution: it’s possible that the printer may leak ink if you’re a high volume user and the ink reservoir fills faster than the ink can evaporate. The purge reservoir can be cleaned out but it requires stripping down of the printer.