How Do I Clean The Printheads On My HP Printer?

Left my very nice HP printer outside in my parents’ garage for 2 years while I was overseas. Of course, when I came back the ink was all clogged inside. So can anyone have any suggestion?

https://www.printerstechnicalsupport.com/how-do-i-clean-the-printheads-on-my-hp-printer
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