How to get black [ink] back?

[Buzz]

Canon inkjet has been problematic of late. Tried the windex trick, and got printer to print a few pages, then it went south again. More windex and deep cleaning cycles, now color is great, and black has completely vanished. Any way to fix? since we have lots of ink carts... or, Where to find replacement print head, since I cant find it on Canon's website? Thanks,

Buzz
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