Hi, welcome to Just answer
Ink absorb er (waste ink pads) is a sponge pad that is located under the chamber where you insert the cartridges. You can locate the waste ink pads to the right of the cartridges. Open the cover, move the cartridges to the center, and then press the pad of absorbent paper towel onto the waste ink pads. This will absorb a lot of ink in the pads and that will remove the warning after you reset the printer waste ink tank counter. Another thing you can do is to completely replace the waste ink pads or maybe take a hot water towel and clean it till the time you see no ink residue on the towel & then let it dry out.
The problem should be solved after you have performed this procedure
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how do I move cartridges to center ?
Open the cover with the unit unplugged you can move them
OK how do I reset the waste ink tank counter ?
To reset waste ink tank counter please follow this procedure
1) Enter SERVICE MODE. By pressing Menu, Copy, Scan, Copy, Copy 2) Select TEST MODE. 3) Select  PRINTER TEST in TEST MODE. 4) Select 3. [EEPROM CLEAR]. 5) Select 0. [INK COUNT]. 6) Press the [Set] key. 7) Press the [Stop/Reset] key (returning to the state of 3)), and then press the [ON/OFF] key.
so you have already tried to clean them and the problem is still there ?
Can you remove the waste ink pads and clean them with warm water..try to run them under warm water and clean the ink as much as you can...after this is done please follow this procedure to reset it
To enter in SERVICE MODE1) Power off Printer2) Push and hold "Resume" button and then push and hold "Power" button3) Hold the Power button, then release and 2 times press Resume button4) Led indicators must change5) Release all buttons6) Then printer in Service Mode(If something wrong, repeat 1-6)To clean absorber counter, 7) Press "Resume" Button 4 Times and after press Power button. It's all! Your absorber count is EMPTY!
Well that is the only way to clean it and solve the problem...unfortunately there is no other way to solve the problem, you can either use warm water to clean it, if that does not solve the problem then you will have to replace the waste ink pads