Printing wrong colors !!!

If what you're saying is still the result after cleaning everything up, there must already be something wrong with the printhead because the printheads are the one's that are responsible for the mixture of the ink cartridges.
Try calling HP Tech Support. They might still be able to replace the printheads for you.

you are lacking colors. so try to check the other color.

try printing the nozzle check page.. you will be able to see which color that is missing... it should have Yellow , Megenta, Cyan and Black... if any one of the color is missing.. try performing head cleaning and after twice cleaning and still no improvement, very high possibility your print head is clogged..

try to change the color ink. horizontal banding (the pink or other color lines appearing means horizontal banding) when there is a problem on one of the heating element of the printer head. since almost all canon printers have head built in the inks, replacing the faulty ink will solve the problem. if not then the controller of printhead on the carriage and mainboard needs to be checked.

Try cleaning the print head. Do this under the tools for the 812c (do not physically clean). You may have to run the clean utility as much as 5 times.

any chance it has dried out? run the test / head cleaning / did you reset the cartridge when you replaced it? generally if one or two colors work - the problem is the ink cartridge or the head for the colors not working. Did you remove the "tape" on the new cartridge?

how can i clean the waste ink?

Try this I triedi in my printer cartridge which was stuck for a while and only prints in red other colors dont. First you remove the cartridges get a clean dry tissue / towel paper and smudge the cartridge printing heads to the tissue it should give all the colors if not the ones that dont may have hardened. Get warm water (Clean) in a bowel and submerge the printing heads on the water not the entire cartridge to dissolve any deposits then try them again. Hope it works it worked on mine.

Assuming you have successfully eliminated cartridge/print head problems, the only other thing to try is to delete the printer software and reinstall [Start/Printers and faxes -right click on the printer icon click delete- install new printer -Have the software disk and handy or select from list- select maker, select model,] I suspect the problem is still print head/cartridge however

Put in original inks and do a few cleans, if that doesn't work replace the head.