Canon MG6650 multi-function inkjet printer (Benson OX10)

This Canon MG6650 multi-function inkjet printer stopped working as the waste ink pad absorber was full and despite a lot of research I couldn't find a way to empty/clean it, so I replaced it and it has sat unused in my home-office for a couple of years. Other than that it had been working fine, and I had just fitted a new print head. If you are more skilled/resourceful than I am and want to try fixing it, it was an excellent colour printer with scan and copy functions too. It comes with some unused cartridges (though not Canon original).