Essential Printer Maintenance....

As I am going to join the Stourbridge Photographic Club, I am going to need my printer in tip top condition and at present it has a few blocked print head holes, for want of their proper name.
Here I am squirting some cleaning liquid into each colour print head to try to unblock the heads so that ink can flow like it should.

I must say this is a tedious job and I am going to let it soak over night before trying the printer.