Canon BJC6000 Maintenance

Would like feed back on thre changing of the “used ink” sponges and the codes to reset the printer after installing the new sponges(called “used ink tank).
Any help would be appreciated or a breakdown of the printer would be helpful. I can’t figureout how to get to these sponges and Canon is of no help at all

Thanks,
Larry Hodge
Email chsr@concentric.net