If your printer is reporting a full waste ink pad, it’s a physical hardware issue. The pads actually need to be cleaned or replaced to prevent ink from leaking into the printer’s electronics.
If you own a Canon printer (specifically the Pixma series), you may have encountered the dreaded "Ink Absorber Full" error or the need to reset the ink counter. The is the industry-standard utility used by technicians to perform these maintenance tasks. canon service tool v 4502 free download