The other day I sought advice on cleaning the printer head on an older Canon machine. The response was to various web sites and discussions.

I didn't see my first reply - wading though the digest sometimes and short msgs can be missed. Here it is again.

I solved the problem with a solution of isopropyl alcohol ( used in windscreen washer products) and an ultrasound bath (optician style). A few minutes of that and some fiddling with head cleaning once re-assembled and a document with bars of red, yellow, blue and black and - back in business.

Probably little point in soaking for days - soapy water - detergents etc. Enzyme based detergents might be OK.

Also might be a bit messy with printers that have the electrodes ON the cartridge.

Bill