Hi,can anyone tell me the correct way to clean the print head on my used epson 1290?it worked perfectly until i changed the colour cartridge,and now does not want to print BLUE.i have tried different new cartridges,a head cleaning cartridge to no avail.when the printer arrived there was a lot of ink underneath the right hand side,but worked fine after a few nozzle cleans,but has now decided to callit a day.Any suggestions please?