Unable to clean????
Were you told to,
1.Clean the jet holes on the ink cartridge, and
2.The area on the printer the ink cartridge jet holes line up with? Plus after doing so insuring that both areas were dry?
You may have ink dried up in those tiny jet holes. A hairdryer set to low heat, and constantly moving back, and forth when using it to dry these areas, helps too.
(After using the Isopropyl alcohol method. Use CAUTION as Isopropyl alcohol is Flammable!
I know, DUH! But it has to be stated.
I use a clean, lint-free cloth, and warm water. Wring the warm water out until the cloth is just lightly damp. BE SURE those above mentioned areas are dry, before reinstalling the ink cartridges!)
3.MFC-3240C off, and unplugged?
(Opening the cover, and closing it helps to remove error codes, as it will reset itself. Unplugging from power, replugging in, and turning on does also. You may still have the error code of unable to clean, because it hasn't be cleared)