Is to simply pump ink through.
It will waste a lot of ink and will not of course necessarily clear a really blocked jet.
Canon ink jets[ and others except Epson] a properly called 'Thermal Ink Jets'
This is because each tiny jet tube[64 or more per colour]has a heater- that vaourizes a portion of ink to pressurize the tube to expel a droplet.
In time - the heater can fail- leaving a white spot of paper .
'Cleaning' will not resolve that problem.
But your method will clear dried out ink - as been mentioned many times in the past.
You used 'Meth' others have used Vodka - each to his own I guess ;-}