How to remove Printheads

Hi, I have just taken apart my Epson stylus SX425W with the same issue blocked Magenta. It’s a real swine of a job to take apart but can be done, when I tested the Black, Yellow and Cyan they were clear as a bell but the Magenta jets are blocked solid, I soaked the printhead in very hot water for 20 mins constantly changing the water and eventually got a dribble of water coming from one of the magenta jets! I then injected print head cleaner in the printhead using rubber tube and syringe and left it for a hour still standing in hot water but no joy, I have tried many other types of solutions but nothing seems to unblock the printhead. I have also noticed a smear / mark on the mirror side of the printhead so my guess is that there may be damage to the printhead caused by something inside the printer catching it. In the end I have now scrapped it, bloody shame as it was a great workhorse printer.

How did you manage to remove the printead please?!!!